diff --git a/src/course-outline/CourseOutline.jsx b/src/course-outline/CourseOutline.jsx
index ccdd7fce0..eabe68076 100644
--- a/src/course-outline/CourseOutline.jsx
+++ b/src/course-outline/CourseOutline.jsx
@@ -27,6 +27,7 @@ import OutlineSideBar from './outline-sidebar/OutlineSidebar';
 import StatusBar from './status-bar/StatusBar';
 import EnableHighlightsModal from './enable-highlights-modal/EnableHighlightsModal';
 import SectionCard from './section-card/SectionCard';
+import SubsectionCard from './subsection-card/SubsectionCard';
 import HighlightsModal from './highlights-modal/HighlightsModal';
 import EmptyPlaceholder from './empty-placeholder/EmptyPlaceholder';
 import PublishModal from './publish-modal/PublishModal';
@@ -71,12 +72,14 @@ const CourseOutline = ({ courseId }) => {
     handleInternetConnectionFailed,
     handleOpenHighlightsModal,
     handleHighlightsFormSubmit,
-    handlePublishSectionSubmit,
     handleConfigureSectionSubmit,
-    handleEditSectionSubmit,
-    handleDeleteSectionSubmit,
+    handlePublishItemSubmit,
+    handleEditSubmit,
+    handleDeleteItemSubmit,
     handleDuplicateSectionSubmit,
+    handleDuplicateSubsectionSubmit,
     handleNewSectionSubmit,
+    handleNewSubsectionSubmit,
   } = useCourseOutline({ courseId });
 
   useEffect(() => {
@@ -158,11 +161,26 @@ const CourseOutline = ({ courseId }) => {
                               onOpenPublishModal={openPublishModal}
                               onOpenConfigureModal={openConfigureModal}
                               onOpenDeleteModal={openDeleteModal}
-                              onEditSectionSubmit={handleEditSectionSubmit}
+                              onEditSectionSubmit={handleEditSubmit}
                               onDuplicateSubmit={handleDuplicateSectionSubmit}
                               isSectionsExpanded={isSectionsExpanded}
+                              onNewSubsectionSubmit={handleNewSubsectionSubmit}
                               ref={listRef}
-                            />
+                            >
+                              {section.childInfo.children.map((subsection) => (
+                                <SubsectionCard
+                                  key={subsection.id}
+                                  section={section}
+                                  subsection={subsection}
+                                  savingStatus={savingStatus}
+                                  onOpenPublishModal={openPublishModal}
+                                  onOpenDeleteModal={openDeleteModal}
+                                  onEditSubmit={handleEditSubmit}
+                                  onDuplicateSubmit={handleDuplicateSubsectionSubmit}
+                                  ref={listRef}
+                                />
+                              ))}
+                            </SectionCard>
                           ))}
                           <Button
                             data-testid="new-section-button"
@@ -201,7 +219,7 @@ const CourseOutline = ({ courseId }) => {
         <PublishModal
           isOpen={isPublishModalOpen}
           onClose={closePublishModal}
-          onPublishSubmit={handlePublishSectionSubmit}
+          onPublishSubmit={handlePublishItemSubmit}
         />
         <ConfigureModal
           isOpen={isConfigureModalOpen}
@@ -211,7 +229,7 @@ const CourseOutline = ({ courseId }) => {
         <DeleteModal
           isOpen={isDeleteModalOpen}
           close={closeDeleteModal}
-          onDeleteSubmit={handleDeleteSectionSubmit}
+          onDeleteSubmit={handleDeleteItemSubmit}
         />
       </Container>
       <div className="alert-toast">
diff --git a/src/course-outline/CourseOutline.scss b/src/course-outline/CourseOutline.scss
index 01afbe0fb..886cc45dc 100644
--- a/src/course-outline/CourseOutline.scss
+++ b/src/course-outline/CourseOutline.scss
@@ -1,6 +1,7 @@
 @import "./header-navigations/HeaderNavigations";
 @import "./status-bar/StatusBar";
 @import "./section-card/SectionCard";
+@import "./subsection-card/SubsectionCard";
 @import "./card-header/CardHeader";
 @import "./empty-placeholder/EmptyPlaceholder";
 @import "./highlights-modal/HighlightsModal";
diff --git a/src/course-outline/CourseOutline.test.jsx b/src/course-outline/CourseOutline.test.jsx
index b6fa767c0..fce1de138 100644
--- a/src/course-outline/CourseOutline.test.jsx
+++ b/src/course-outline/CourseOutline.test.jsx
@@ -1,6 +1,6 @@
 import React from 'react';
 import {
-  render, waitFor, cleanup, fireEvent,
+  render, waitFor, cleanup, fireEvent, within,
 } from '@testing-library/react';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
 import { AppProvider } from '@edx/frontend-platform/react';
@@ -15,21 +15,24 @@ import {
   getCourseReindexApiUrl,
   getXBlockApiUrl,
   getEnableHighlightsEmailsApiUrl,
-  getUpdateCourseSectionApiUrl,
+  getCourseItemApiUrl,
   getXBlockBaseApiUrl,
 } from './data/api';
 import {
-  addNewCourseSectionQuery,
+  addNewSectionQuery,
+  addNewSubsectionQuery,
   deleteCourseSectionQuery,
-  duplicateCourseSectionQuery,
-  editCourseSectionQuery,
+  deleteCourseSubsectionQuery,
+  duplicateSectionQuery,
+  duplicateSubsectionQuery,
+  editCourseItemQuery,
   enableCourseHighlightsEmailsQuery,
   fetchCourseBestPracticesQuery,
   fetchCourseLaunchQuery,
   fetchCourseOutlineIndexQuery,
   fetchCourseReindexQuery,
   fetchCourseSectionQuery,
-  publishCourseSectionQuery,
+  publishCourseItemQuery,
   updateCourseSectionHighlightsQuery,
 } from './data/thunk';
 import initializeStore from '../store';
@@ -39,6 +42,7 @@ import {
   courseBestPracticesMock,
   courseLaunchMock,
   courseSectionMock,
+  courseSubsectionMock,
 } from './__mocks__';
 import { executeThunk } from '../utils';
 import CourseOutline from './CourseOutline';
@@ -129,13 +133,34 @@ describe('<CourseOutline />', () => {
     axiosMock
       .onGet(getXBlockApiUrl(courseSectionMock.id))
       .reply(200, courseSectionMock);
-    await executeThunk(addNewCourseSectionQuery(courseId), store.dispatch);
+    await executeThunk(addNewSectionQuery(courseId), store.dispatch);
 
     element = await findAllByTestId('section-card');
     expect(element.length).toBe(5);
     expect(window.HTMLElement.prototype.scrollIntoView).toBeCalled();
   });
 
+  it('adds new subsection correctly', async () => {
+    const { findAllByTestId } = render(<RootWrapper />);
+    const sectionId = courseOutlineIndexMock.courseStructure.childInfo.children[0].id;
+    const [section] = await findAllByTestId('section-card');
+    let subsections = await within(section).findAllByTestId('subsection-card');
+    expect(subsections.length).toBe(1);
+
+    axiosMock
+      .onPost(getXBlockBaseApiUrl())
+      .reply(200, {
+        locator: courseSubsectionMock.id,
+      });
+    axiosMock
+      .onGet(getXBlockApiUrl(courseSubsectionMock.id))
+      .reply(200, courseSubsectionMock);
+    await executeThunk(addNewSubsectionQuery(sectionId), store.dispatch);
+
+    subsections = await within(section).findAllByTestId('subsection-card');
+    expect(subsections.length).toBe(2);
+  });
+
   it('render error alert after failed reindex correctly', async () => {
     const { getByText } = render(<RootWrapper />);
 
@@ -196,18 +221,17 @@ describe('<CourseOutline />', () => {
   });
 
   it('should expand and collapse subsections, after click on subheader buttons', async () => {
-    const { queryAllByTestId, getByText } = render(<RootWrapper />);
+    const { queryAllByTestId, findByText } = render(<RootWrapper />);
+
+    const collapseBtn = await findByText(headerMessages.collapseAllButton.defaultMessage);
+    expect(collapseBtn).toBeInTheDocument();
+    fireEvent.click(collapseBtn);
+
+    const expandBtn = await findByText(headerMessages.expandAllButton.defaultMessage);
+    expect(expandBtn).toBeInTheDocument();
+    fireEvent.click(expandBtn);
 
     await waitFor(() => {
-      const collapseBtn = getByText(headerMessages.collapseAllButton.defaultMessage);
-      expect(collapseBtn).toBeInTheDocument();
-      fireEvent.click(collapseBtn);
-
-      const expendBtn = getByText(headerMessages.expandAllButton.defaultMessage);
-      expect(expendBtn).toBeInTheDocument();
-
-      fireEvent.click(expendBtn);
-
       const cardSubsections = queryAllByTestId('section-card__subsections');
       cardSubsections.forEach(element => expect(element).toBeVisible());
 
@@ -236,14 +260,14 @@ describe('<CourseOutline />', () => {
     const section = courseOutlineIndexMock.courseStructure.childInfo.children[0];
 
     axiosMock
-      .onPost(getUpdateCourseSectionApiUrl(section.id, {
+      .onPost(getCourseItemApiUrl(section.id, {
         metadata: {
           display_name: newDisplayName,
         },
       }))
       .reply(200);
 
-    await executeThunk(editCourseSectionQuery(section.id, newDisplayName), store.dispatch);
+    await executeThunk(editCourseItemQuery(section.id, section.id, newDisplayName), store.dispatch);
 
     axiosMock
       .onGet(getXBlockApiUrl(section.id))
@@ -255,11 +279,14 @@ describe('<CourseOutline />', () => {
     });
   });
 
-  it('check delete section when edit query is successfully', async () => {
+  it('check whether section is deleted when delete query is successfully', async () => {
     const { queryByText } = render(<RootWrapper />);
     const section = courseOutlineIndexMock.courseStructure.childInfo.children[1];
+    await waitFor(() => {
+      expect(queryByText(section.displayName)).toBeInTheDocument();
+    });
 
-    axiosMock.onDelete(getUpdateCourseSectionApiUrl(section.id)).reply(200);
+    axiosMock.onDelete(getCourseItemApiUrl(section.id)).reply(200);
     await executeThunk(deleteCourseSectionQuery(section.id), store.dispatch);
 
     await waitFor(() => {
@@ -267,22 +294,72 @@ describe('<CourseOutline />', () => {
     });
   });
 
-  it('check duplicate section when duplicate query is successfully', async () => {
-    const { getAllByTestId } = render(<RootWrapper />);
+  it('check whether subsection is deleted when delete query is successfully', async () => {
+    const { queryByText } = render(<RootWrapper />);
+    const section = courseOutlineIndexMock.courseStructure.childInfo.children[1];
+    const [subsection] = section.childInfo.children;
+    await waitFor(() => {
+      expect(queryByText(subsection.displayName)).toBeInTheDocument();
+    });
+
+    axiosMock.onDelete(getCourseItemApiUrl(subsection.id)).reply(200);
+    await executeThunk(deleteCourseSubsectionQuery(subsection.id, section.id), store.dispatch);
+
+    await waitFor(() => {
+      expect(queryByText(subsection.displayName)).not.toBeInTheDocument();
+    });
+  });
+
+  it('check whether section is duplicated successfully', async () => {
+    const { findAllByTestId } = render(<RootWrapper />);
     const section = courseOutlineIndexMock.courseStructure.childInfo.children[0];
+    const sectionId = section.id;
     const courseBlockId = courseOutlineIndexMock.courseStructure.id;
+    expect(await findAllByTestId('section-card')).toHaveLength(4);
 
     axiosMock
       .onPost(getXBlockBaseApiUrl())
       .reply(200, {
-        duplicate_source_locator: section.id,
-        parent_locator: courseBlockId,
+        locator: courseSectionMock.id,
       });
-    await executeThunk(duplicateCourseSectionQuery(section.id, courseBlockId), store.dispatch);
+    section.id = courseSectionMock.id;
+    axiosMock
+      .onGet(getXBlockApiUrl(section.id))
+      .reply(200, {
+        ...section,
+      });
+    await executeThunk(duplicateSectionQuery(sectionId, courseBlockId), store.dispatch);
 
-    await waitFor(() => {
-      expect(getAllByTestId('section-card')).toHaveLength(4);
-    });
+    expect(await findAllByTestId('section-card')).toHaveLength(5);
+  });
+
+  it('check whether subsection is duplicated successfully', async () => {
+    const { findAllByTestId } = render(<RootWrapper />);
+    const section = courseOutlineIndexMock.courseStructure.childInfo.children[0];
+    let [sectionElement] = await findAllByTestId('section-card');
+    const [subsection] = section.childInfo.children;
+    const subsectionId = subsection.id;
+    let subsections = await within(sectionElement).findAllByTestId('subsection-card');
+    expect(subsections.length).toBe(1);
+
+    axiosMock
+      .onPost(getXBlockBaseApiUrl())
+      .reply(200, {
+        locator: courseSubsectionMock.id,
+      });
+    subsection.id = courseSubsectionMock.id;
+    section.childInfo.children = [...section.childInfo.children, subsection];
+    axiosMock
+      .onGet(getXBlockApiUrl(section.id))
+      .reply(200, {
+        ...section,
+      });
+
+    await executeThunk(duplicateSubsectionQuery(subsectionId, section.id), store.dispatch);
+
+    [sectionElement] = await findAllByTestId('section-card');
+    subsections = await within(sectionElement).findAllByTestId('subsection-card');
+    expect(subsections.length).toBe(2);
   });
 
   it('check publish section when publish query is successfully', async () => {
@@ -307,12 +384,12 @@ describe('<CourseOutline />', () => {
       });
 
     axiosMock
-      .onPost(getUpdateCourseSectionApiUrl(section.id), {
+      .onPost(getCourseItemApiUrl(section.id), {
         publish: 'make_public',
       })
       .reply(200);
 
-    await executeThunk(publishCourseSectionQuery(section.id), store.dispatch);
+    await executeThunk(publishCourseItemQuery(section.id, section.id), store.dispatch);
 
     axiosMock
       .onGet(getXBlockApiUrl(section.id))
@@ -325,7 +402,7 @@ describe('<CourseOutline />', () => {
     await executeThunk(fetchCourseSectionQuery(section.id), store.dispatch);
 
     const firstSection = getAllByTestId('section-card')[0];
-    expect(firstSection.querySelector('.section-card-header__badge-status')).toHaveTextContent('Published not live');
+    expect(firstSection.querySelector('.item-card-header__badge-status')).toHaveTextContent('Published not live');
   });
 
   it('check configure section when configure query is successful', async () => {
@@ -334,7 +411,7 @@ describe('<CourseOutline />', () => {
     const section = courseOutlineIndexMock.courseStructure.childInfo.children[0];
     const newReleaseDate = '2025-08-10T10:00:00Z';
     axiosMock
-      .onPost(getUpdateCourseSectionApiUrl(section.id), {
+      .onPost(getCourseItemApiUrl(section.id), {
         id: section.id,
         data: null,
         metadata: {
@@ -390,7 +467,7 @@ describe('<CourseOutline />', () => {
     ];
 
     axiosMock
-      .onPost(getUpdateCourseSectionApiUrl(section.id), {
+      .onPost(getCourseItemApiUrl(section.id), {
         publish: 'republish',
         metadata: {
           highlights,
diff --git a/src/course-outline/__mocks__/courseSubsection.js b/src/course-outline/__mocks__/courseSubsection.js
new file mode 100644
index 000000000..a7e72d0ef
--- /dev/null
+++ b/src/course-outline/__mocks__/courseSubsection.js
@@ -0,0 +1,101 @@
+module.exports = {
+  id: 'block-v1:edX+DemoX+Demo_Course+type@sequential+block@b713bc2830f34f6f87554028c3068729',
+  display_name: 'Subsection',
+  category: 'sequential',
+  has_children: true,
+  edited_on: 'Dec 05, 2023 at 10:35 UTC',
+  published: true,
+  published_on: 'Dec 05, 2023 at 10:35 UTC',
+  studio_url: '/course/course-v1:edX+DemoX+Demo_Course?show=block-v1%3AedX%2BDemoX%2BDemo_Course%2Btype%40sequential%2Bblock%40b713bc2830f34f6f87554028c3068729',
+  released_to_students: true,
+  release_date: 'Feb 05, 2013 at 05:00 UTC',
+  visibility_state: 'live',
+  has_explicit_staff_lock: false,
+  start: '2013-02-05T05:00:00Z',
+  graded: false,
+  due_date: '',
+  due: null,
+  relative_weeks_due: null,
+  format: null,
+  course_graders: [
+    'Homework',
+    'Exam',
+  ],
+  has_changes: false,
+  actions: {
+    deletable: true,
+    draggable: true,
+    childAddable: true,
+    duplicable: true,
+  },
+  explanatory_message: null,
+  group_access: {},
+  user_partitions: [
+    {
+      id: 50,
+      name: 'Enrollment Track Groups',
+      scheme: 'enrollment_track',
+      groups: [
+        {
+          id: 2,
+          name: 'Verified Certificate',
+          selected: false,
+          deleted: false,
+        },
+        {
+          id: 1,
+          name: 'Audit',
+          selected: false,
+          deleted: false,
+        },
+      ],
+    },
+  ],
+  show_correctness: 'always',
+  hide_after_due: false,
+  is_proctored_exam: false,
+  was_exam_ever_linked_with_external: false,
+  online_proctoring_rules: '',
+  is_practice_exam: false,
+  is_onboarding_exam: false,
+  is_time_limited: false,
+  exam_review_rules: '',
+  default_time_limit_minutes: null,
+  proctoring_exam_configuration_link: null,
+  supports_onboarding: false,
+  show_review_rules: true,
+  child_info: {
+    category: 'vertical',
+    display_name: 'Unit',
+    children: [],
+  },
+  ancestor_has_staff_lock: false,
+  staff_only_message: false,
+  enable_copy_paste_units: false,
+  has_partition_group_components: false,
+  user_partition_info: {
+    selectable_partitions: [
+      {
+        id: 50,
+        name: 'Enrollment Track Groups',
+        scheme: 'enrollment_track',
+        groups: [
+          {
+            id: 2,
+            name: 'Verified Certificate',
+            selected: false,
+            deleted: false,
+          },
+          {
+            id: 1,
+            name: 'Audit',
+            selected: false,
+            deleted: false,
+          },
+        ],
+      },
+    ],
+    selected_partition_index: -1,
+    selected_groups_label: '',
+  },
+};
diff --git a/src/course-outline/__mocks__/index.js b/src/course-outline/__mocks__/index.js
index 942145257..15c6504cb 100644
--- a/src/course-outline/__mocks__/index.js
+++ b/src/course-outline/__mocks__/index.js
@@ -3,3 +3,4 @@ export { default as courseOutlineIndexWithoutSections } from './courseOutlineInd
 export { default as courseBestPracticesMock } from './courseBestPractices';
 export { default as courseLaunchMock } from './courseLaunch';
 export { default as courseSectionMock } from './courseSection';
+export { default as courseSubsectionMock } from './courseSubsection';
diff --git a/src/course-outline/card-header/CardHeader.jsx b/src/course-outline/card-header/CardHeader.jsx
index eeedf676b..150d90c26 100644
--- a/src/course-outline/card-header/CardHeader.jsx
+++ b/src/course-outline/card-header/CardHeader.jsx
@@ -20,13 +20,13 @@ import {
 import classNames from 'classnames';
 
 import { useEscapeClick } from '../../hooks';
-import { SECTION_BADGE_STATUTES } from '../constants';
-import { getSectionStatusBadgeContent } from '../utils';
+import { ITEM_BADGE_STATUS } from '../constants';
+import { getItemStatusBadgeContent } from '../utils';
 import messages from './messages';
 
 const CardHeader = ({
   title,
-  sectionStatus,
+  status,
   hasChanges,
   isExpanded,
   onClickPublish,
@@ -40,13 +40,14 @@ const CardHeader = ({
   isDisabledEditField,
   onClickDelete,
   onClickDuplicate,
+  namePrefix,
 }) => {
   const intl = useIntl();
   const [titleValue, setTitleValue] = useState(title);
 
-  const { badgeTitle, badgeIcon } = getSectionStatusBadgeContent(sectionStatus, messages, intl);
-  const isDisabledPublish = (sectionStatus === SECTION_BADGE_STATUTES.live
-    || sectionStatus === SECTION_BADGE_STATUTES.publishedNotLive) && !hasChanges;
+  const { badgeTitle, badgeIcon } = getItemStatusBadgeContent(status, messages, intl);
+  const isDisabledPublish = (status === ITEM_BADGE_STATUS.live
+    || status === ITEM_BADGE_STATUS.publishedNotLive) && !hasChanges;
 
   useEscapeClick({
     onEscape: () => {
@@ -57,7 +58,7 @@ const CardHeader = ({
   });
 
   return (
-    <div className="section-card-header" data-testid="section-card-header">
+    <div className="item-card-header" data-testid={`${namePrefix}-card-header`}>
       {isFormOpen ? (
         <Form.Group className="m-0">
           <Form.Control
@@ -82,7 +83,7 @@ const CardHeader = ({
           overlay={(
             <Tooltip
               id={intl.formatMessage(messages.expandTooltip)}
-              className="section-card-header-tooltip"
+              className="item-card-header-tooltip"
             >
               {intl.formatMessage(messages.expandTooltip)}
             </Tooltip>
@@ -91,18 +92,18 @@ const CardHeader = ({
           <Button
             iconBefore={isExpanded ? ArrowUpIcon : ArrowDownIcon}
             variant="tertiary"
-            data-testid="section-card-header__expanded-btn"
-            className="section-card-header__expanded-btn"
+            data-testid={`${namePrefix}-card-header__expanded-btn`}
+            className="item-card-header__expanded-btn"
             onClick={() => onExpand((prevState) => !prevState)}
           >
-            <Truncate lines={1} className="h3 mb-0">{title}</Truncate>
+            <Truncate lines={1} className={`${namePrefix}-card-title mb-0`}>{title}</Truncate>
             {badgeTitle && (
-              <div className="section-card-header__badge-status" data-testid="section-card-header__badge-status">
+              <div className="item-card-header__badge-status" data-testid={`${namePrefix}-card-header__badge-status`}>
                 {badgeIcon && (
                   <Icon
                     src={badgeIcon}
                     size="sm"
-                    className={classNames({ 'text-success-500': sectionStatus === SECTION_BADGE_STATUTES.live })}
+                    className={classNames({ 'text-success-500': status === ITEM_BADGE_STATUS.live })}
                   />
                 )}
                 <span className="small">{badgeTitle}</span>
@@ -120,14 +121,14 @@ const CardHeader = ({
             onClick={onClickEdit}
           />
         )}
-        <Dropdown data-testid="section-card-header__menu" onClick={onClickMenuButton}>
+        <Dropdown data-testid={`${namePrefix}-card-header__menu`} onClick={onClickMenuButton}>
           <Dropdown.Toggle
-            className="section-card-header__menu"
-            id="section-card-header__menu"
-            data-testid="section-card-header__menu-button"
+            className="item-card-header__menu"
+            id={`${namePrefix}-card-header__menu`}
+            data-testid={`${namePrefix}-card-header__menu-button`}
             as={IconButton}
             src={MoveVertIcon}
-            alt="section-card-header__menu"
+            alt={`${namePrefix}-card-header__menu`}
             iconAs={Icon}
           />
           <Dropdown.Menu>
@@ -149,7 +150,7 @@ const CardHeader = ({
 
 CardHeader.propTypes = {
   title: PropTypes.string.isRequired,
-  sectionStatus: PropTypes.string.isRequired,
+  status: PropTypes.string.isRequired,
   hasChanges: PropTypes.bool.isRequired,
   isExpanded: PropTypes.bool.isRequired,
   onExpand: PropTypes.func.isRequired,
@@ -163,6 +164,7 @@ CardHeader.propTypes = {
   isDisabledEditField: PropTypes.bool.isRequired,
   onClickDelete: PropTypes.func.isRequired,
   onClickDuplicate: PropTypes.func.isRequired,
+  namePrefix: PropTypes.string.isRequired,
 };
 
 export default CardHeader;
diff --git a/src/course-outline/card-header/CardHeader.scss b/src/course-outline/card-header/CardHeader.scss
index e2ea48bd3..12744ba9f 100644
--- a/src/course-outline/card-header/CardHeader.scss
+++ b/src/course-outline/card-header/CardHeader.scss
@@ -1,9 +1,9 @@
-.section-card-header {
+.item-card-header {
   display: flex;
   align-items: center;
   margin-right: -.5rem;
 
-  .section-card-header__expanded-btn {
+  .item-card-header__expanded-btn {
     justify-content: flex-start;
     padding: 0;
     width: 80%;
@@ -13,7 +13,7 @@
     color: $black;
   }
 
-  .section-card-header__badge-status {
+  .item-card-header__badge-status {
     display: flex;
     padding: 1px .5rem;
     justify-content: center;
@@ -33,7 +33,7 @@
   }
 }
 
-.section-card-header-tooltip {
+.item-card-header-tooltip {
   .tooltip-inner {
     max-width: 18.75rem;
   }
diff --git a/src/course-outline/card-header/CardHeader.test.jsx b/src/course-outline/card-header/CardHeader.test.jsx
index 93a07fb5c..e9269531c 100644
--- a/src/course-outline/card-header/CardHeader.test.jsx
+++ b/src/course-outline/card-header/CardHeader.test.jsx
@@ -2,7 +2,7 @@ import React from 'react';
 import { render, fireEvent, waitFor } from '@testing-library/react';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
 
-import { SECTION_BADGE_STATUTES } from '../constants';
+import { ITEM_BADGE_STATUS } from '../constants';
 import CardHeader from './CardHeader';
 import messages from './messages';
 
@@ -16,7 +16,7 @@ const closeFormMock = jest.fn();
 
 const cardHeaderProps = {
   title: 'Some title',
-  sectionStatus: SECTION_BADGE_STATUTES.live,
+  status: ITEM_BADGE_STATUS.live,
   hasChanges: false,
   isExpanded: true,
   onExpand: onExpandMock,
@@ -29,6 +29,7 @@ const cardHeaderProps = {
   isDisabledEditField: false,
   onClickDelete: onClickDeleteMock,
   onClickDuplicate: onClickDuplicateMock,
+  namePrefix: 'section',
 };
 
 const renderComponent = (props) => render(
@@ -61,7 +62,7 @@ describe('<CardHeader />', () => {
   it('render status badge as published_not_live', async () => {
     const { findByText } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.publishedNotLive,
+      status: ITEM_BADGE_STATUS.publishedNotLive,
     });
 
     expect(await findByText(messages.statusBadgePublishedNotLive.defaultMessage)).toBeInTheDocument();
@@ -70,7 +71,7 @@ describe('<CardHeader />', () => {
   it('render status badge as staff_only', async () => {
     const { findByText } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.staffOnly,
+      status: ITEM_BADGE_STATUS.staffOnly,
     });
 
     expect(await findByText(messages.statusBadgeStaffOnly.defaultMessage)).toBeInTheDocument();
@@ -79,7 +80,7 @@ describe('<CardHeader />', () => {
   it('render status badge as draft', async () => {
     const { findByText } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.draft,
+      status: ITEM_BADGE_STATUS.draft,
     });
 
     expect(await findByText(messages.statusBadgeDraft.defaultMessage)).toBeInTheDocument();
@@ -88,7 +89,7 @@ describe('<CardHeader />', () => {
   it('check publish menu item is disabled when section status is live or published not live and it has no changes', async () => {
     const { findByText, findByTestId } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.publishedNotLive,
+      status: ITEM_BADGE_STATUS.publishedNotLive,
     });
 
     const menuButton = await findByTestId('section-card-header__menu-button');
@@ -99,7 +100,7 @@ describe('<CardHeader />', () => {
   it('check publish menu item is enabled when section status is live or published not live and it has changes', async () => {
     const { findByText, findByTestId } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.publishedNotLive,
+      status: ITEM_BADGE_STATUS.publishedNotLive,
       hasChanges: true,
     });
 
@@ -129,7 +130,7 @@ describe('<CardHeader />', () => {
   it('calls onClickPublish when item is clicked', async () => {
     const { findByText, findByTestId } = renderComponent({
       ...cardHeaderProps,
-      sectionStatus: SECTION_BADGE_STATUTES.draft,
+      status: ITEM_BADGE_STATUS.draft,
     });
 
     const menuButton = await findByTestId('section-card-header__menu-button');
diff --git a/src/course-outline/configure-modal/ConfigureModal.jsx b/src/course-outline/configure-modal/ConfigureModal.jsx
index cedcf0198..5490ef894 100644
--- a/src/course-outline/configure-modal/ConfigureModal.jsx
+++ b/src/course-outline/configure-modal/ConfigureModal.jsx
@@ -12,7 +12,7 @@ import {
 import { useSelector } from 'react-redux';
 
 import { VisibilityTypes } from '../../data/constants';
-import { getCurrentSection } from '../data/selectors';
+import { getCurrentItem } from '../data/selectors';
 import messages from './messages';
 import BasicTab from './BasicTab';
 import VisibilityTab from './VisibilityTab';
@@ -23,7 +23,7 @@ const ConfigureModal = ({
   onConfigureSubmit,
 }) => {
   const intl = useIntl();
-  const { displayName, start: sectionStartDate, visibilityState } = useSelector(getCurrentSection);
+  const { displayName, start: sectionStartDate, visibilityState } = useSelector(getCurrentItem);
   const [releaseDate, setReleaseDate] = useState(sectionStartDate);
   const [isVisibleToStaffOnly, setIsVisibleToStaffOnly] = useState(visibilityState === VisibilityTypes.STAFF_ONLY);
   const [saveButtonDisabled, setSaveButtonDisabled] = useState(true);
diff --git a/src/course-outline/constants.js b/src/course-outline/constants.js
index 2015c519e..f9a2c8821 100644
--- a/src/course-outline/constants.js
+++ b/src/course-outline/constants.js
@@ -1,4 +1,4 @@
-export const SECTION_BADGE_STATUTES = /** @type {const} */ ({
+export const ITEM_BADGE_STATUS = /** @type {const} */ ({
   live: 'live',
   publishedNotLive: 'published_not_live',
   staffOnly: 'staff_only',
@@ -15,9 +15,10 @@ export const CHECKLIST_FILTERS = /** @type {const} */ ({
   INSTRUCTOR_PACED: 'INSTRUCTOR_PACED',
 });
 
-export const DEFAULT_NEW_DISPLAY_NAMES = /** @type {const} */ ({
-  chapter: 'Section',
-  subsection: 'Subsection',
+export const COURSE_BLOCK_NAMES = /** @type {const} */ ({
+  chapter: { id: 'chapter', name: 'Section' },
+  sequential: { id: 'sequential', name: 'Subsection' },
+  vertical: { id: 'vertical', name: 'Unit' },
 });
 
 export const LAUNCH_CHECKLIST = /** @type {const} */ ({
diff --git a/src/course-outline/data/api.js b/src/course-outline/data/api.js
index 27209e06e..5714fa9ad 100644
--- a/src/course-outline/data/api.js
+++ b/src/course-outline/data/api.js
@@ -26,7 +26,7 @@ export const getEnableHighlightsEmailsApiUrl = (courseId) => {
 
 export const getCourseReindexApiUrl = (reindexLink) => `${getApiBaseUrl()}${reindexLink}`;
 export const getXBlockBaseApiUrl = () => `${getApiBaseUrl()}/xblock/`;
-export const getUpdateCourseSectionApiUrl = (sectionId) => `${getXBlockBaseApiUrl()}${sectionId}`;
+export const getCourseItemApiUrl = (itemId) => `${getXBlockBaseApiUrl()}${itemId}`;
 export const getXBlockApiUrl = (blockId) => `${getXBlockBaseApiUrl()}outline/${blockId}`;
 
 /**
@@ -174,12 +174,12 @@ export async function restartIndexingOnCourse(reindexLink) {
 
 /**
  * Get course section
- * @param {string} sectionId
+ * @param {string} itemId
  * @returns {Promise<section>}
  */
-export async function getCourseSection(sectionId) {
+export async function getCourseItem(itemId) {
   const { data } = await getAuthenticatedHttpClient()
-    .get(getXBlockApiUrl(sectionId));
+    .get(getXBlockApiUrl(itemId));
   return camelCaseObject(data);
 }
 
@@ -191,7 +191,7 @@ export async function getCourseSection(sectionId) {
  */
 export async function updateCourseSectionHighlights(sectionId, highlights) {
   const { data } = await getAuthenticatedHttpClient()
-    .post(getUpdateCourseSectionApiUrl(sectionId), {
+    .post(getCourseItemApiUrl(sectionId), {
       publish: 'republish',
       metadata: {
         highlights,
@@ -208,7 +208,7 @@ export async function updateCourseSectionHighlights(sectionId, highlights) {
  */
 export async function publishCourseSection(sectionId) {
   const { data } = await getAuthenticatedHttpClient()
-    .post(getUpdateCourseSectionApiUrl(sectionId), {
+    .post(getCourseItemApiUrl(sectionId), {
       publish: 'make_public',
     });
 
@@ -222,7 +222,7 @@ export async function publishCourseSection(sectionId) {
  */
 export async function configureCourseSection(sectionId, isVisibleToStaffOnly, startDatetime) {
   const { data } = await getAuthenticatedHttpClient()
-    .post(getUpdateCourseSectionApiUrl(sectionId), {
+    .post(getCourseItemApiUrl(sectionId), {
       publish: 'republish',
       metadata: {
         // The backend expects metadata.visible_to_staff_only to either true or null
@@ -236,13 +236,13 @@ export async function configureCourseSection(sectionId, isVisibleToStaffOnly, st
 
 /**
  * Edit course section
- * @param {string} sectionId
+ * @param {string} itemId
  * @param {string} displayName
  * @returns {Promise<Object>}
  */
-export async function editCourseSection(sectionId, displayName) {
+export async function editItemDisplayName(itemId, displayName) {
   const { data } = await getAuthenticatedHttpClient()
-    .post(getUpdateCourseSectionApiUrl(sectionId), {
+    .post(getCourseItemApiUrl(itemId), {
       metadata: {
         display_name: displayName,
       },
@@ -253,27 +253,27 @@ export async function editCourseSection(sectionId, displayName) {
 
 /**
  * Delete course section
- * @param {string} sectionId
+ * @param {string} itemId
  * @returns {Promise<Object>}
  */
-export async function deleteCourseSection(sectionId) {
+export async function deleteCourseItem(itemId) {
   const { data } = await getAuthenticatedHttpClient()
-    .delete(getUpdateCourseSectionApiUrl(sectionId));
+    .delete(getCourseItemApiUrl(itemId));
 
   return data;
 }
 
 /**
  * Duplicate course section
- * @param {string} sectionId
- * @param {string} courseBlockId
+ * @param {string} itemId
+ * @param {string} parentId
  * @returns {Promise<Object>}
  */
-export async function duplicateCourseSection(sectionId, courseBlockId) {
+export async function duplicateCourseItem(itemId, parentId) {
   const { data } = await getAuthenticatedHttpClient()
     .post(getXBlockBaseApiUrl(), {
-      duplicate_source_locator: sectionId,
-      parent_locator: courseBlockId,
+      duplicate_source_locator: itemId,
+      parent_locator: parentId,
     });
 
   return data;
@@ -281,13 +281,15 @@ export async function duplicateCourseSection(sectionId, courseBlockId) {
 
 /**
  * Add new course item like section, subsection or unit.
- * @param {string} courseBlockId
+ * @param {string} parentLocator
+ * @param {string} category
+ * @param {string} displayName
  * @returns {Promise<Object>}
  */
-export async function addNewCourseItem(courseBlockId, category, displayName) {
+export async function addNewCourseItem(parentLocator, category, displayName) {
   const { data } = await getAuthenticatedHttpClient()
     .post(getXBlockBaseApiUrl(), {
-      parent_locator: courseBlockId,
+      parent_locator: parentLocator,
       category,
       display_name: displayName,
     });
diff --git a/src/course-outline/data/selectors.js b/src/course-outline/data/selectors.js
index ca05ae6ff..4e0c28375 100644
--- a/src/course-outline/data/selectors.js
+++ b/src/course-outline/data/selectors.js
@@ -3,4 +3,6 @@ export const getLoadingStatus = (state) => state.courseOutline.loadingStatus;
 export const getStatusBarData = (state) => state.courseOutline.statusBarData;
 export const getSavingStatus = (state) => state.courseOutline.savingStatus;
 export const getSectionsList = (state) => state.courseOutline.sectionsList;
+export const getCurrentItem = (state) => state.courseOutline.currentItem;
 export const getCurrentSection = (state) => state.courseOutline.currentSection;
+export const getCurrentSubsection = (state) => state.courseOutline.currentSubsection;
diff --git a/src/course-outline/data/slice.js b/src/course-outline/data/slice.js
index 79e227b6e..72b1b4179 100644
--- a/src/course-outline/data/slice.js
+++ b/src/course-outline/data/slice.js
@@ -26,6 +26,8 @@ const slice = createSlice({
     },
     sectionsList: [],
     currentSection: {},
+    currentSubsection: {},
+    currentItem: {},
   },
   reducers: {
     fetchOutlineIndexSuccess: (state, { payload }) => {
@@ -71,22 +73,69 @@ const slice = createSlice({
     updateSectionList: (state, { payload }) => {
       state.sectionsList = state.sectionsList.map((section) => (section.id === payload.id ? payload : section));
     },
+    setCurrentItem: (state, { payload }) => {
+      state.currentItem = payload;
+    },
     setCurrentSection: (state, { payload }) => {
       state.currentSection = payload;
     },
+    setCurrentSubsection: (state, { payload }) => {
+      state.currentSubsection = payload;
+    },
     addSection: (state, { payload }) => {
       state.sectionsList = [
         ...state.sectionsList,
         payload,
       ];
     },
+    addSubsection: (state, { payload }) => {
+      state.sectionsList = state.sectionsList.map((section) => {
+        if (section.id === payload.parentLocator) {
+          section.childInfo.children = [
+            ...section.childInfo.children,
+            payload.data,
+          ];
+        }
+        return section;
+      });
+    },
     deleteSection: (state, { payload }) => {
-      state.sectionsList = state.sectionsList.filter(({ id }) => id !== payload);
+      state.sectionsList = state.sectionsList.filter(
+        ({ id }) => id !== payload.itemId,
+      );
+    },
+    deleteSubsection: (state, { payload }) => {
+      state.sectionsList = state.sectionsList.map((section) => {
+        if (section.id !== payload.sectionId) {
+          return section;
+        }
+        section.childInfo.children = section.childInfo.children.filter(
+          ({ id }) => id !== payload.itemId,
+        );
+        return section;
+      });
+    },
+    deleteUnit: (state, { payload }) => {
+      state.sectionsList = state.sectionsList.map((section) => {
+        if (section.id !== payload.sectionId) {
+          return section;
+        }
+        section.childInfo.children = section.childInfo.children.map((subsection) => {
+          if (subsection.id !== payload.subsectionId) {
+            return subsection;
+          }
+          subsection.childInfo.children = subsection.childInfo.children.filter(
+            ({ id }) => id !== payload.itemId,
+          );
+          return subsection;
+        });
+        return section;
+      });
     },
     duplicateSection: (state, { payload }) => {
       state.sectionsList = state.sectionsList.reduce((result, currentValue) => {
         if (currentValue.id === payload.id) {
-          return [...result, currentValue, payload.duplicatedSection];
+          return [...result, currentValue, payload.duplicatedItem];
         }
         return [...result, currentValue];
       }, []);
@@ -96,6 +145,7 @@ const slice = createSlice({
 
 export const {
   addSection,
+  addSubsection,
   fetchOutlineIndexSuccess,
   updateOutlineIndexLoadingStatus,
   updateReindexLoadingStatus,
@@ -105,8 +155,12 @@ export const {
   updateFetchSectionLoadingStatus,
   updateSavingStatus,
   updateSectionList,
+  setCurrentItem,
   setCurrentSection,
+  setCurrentSubsection,
   deleteSection,
+  deleteSubsection,
+  deleteUnit,
   duplicateSection,
 } = slice.actions;
 
diff --git a/src/course-outline/data/thunk.js b/src/course-outline/data/thunk.js
index 39cd34698..cd08ff7d5 100644
--- a/src/course-outline/data/thunk.js
+++ b/src/course-outline/data/thunk.js
@@ -1,6 +1,6 @@
 import { RequestStatus } from '../../data/constants';
 import { NOTIFICATION_MESSAGES } from '../../constants';
-import { DEFAULT_NEW_DISPLAY_NAMES } from '../constants';
+import { COURSE_BLOCK_NAMES } from '../constants';
 import {
   hideProcessingNotification,
   showProcessingNotification,
@@ -11,14 +11,14 @@ import {
 } from '../utils/getChecklistForStatusBar';
 import {
   addNewCourseItem,
-  deleteCourseSection,
-  duplicateCourseSection,
-  editCourseSection,
+  deleteCourseItem,
+  duplicateCourseItem,
+  editItemDisplayName,
   enableCourseHighlightsEmails,
   getCourseBestPractices,
   getCourseLaunch,
   getCourseOutlineIndex,
-  getCourseSection,
+  getCourseItem,
   publishCourseSection,
   configureCourseSection,
   restartIndexingOnCourse,
@@ -26,6 +26,7 @@ import {
 } from './api';
 import {
   addSection,
+  addSubsection,
   fetchOutlineIndexSuccess,
   updateOutlineIndexLoadingStatus,
   updateReindexLoadingStatus,
@@ -36,6 +37,8 @@ import {
   updateSectionList,
   updateFetchSectionLoadingStatus,
   deleteSection,
+  deleteSubsection,
+  deleteUnit,
   duplicateSection,
 } from './slice';
 
@@ -129,7 +132,7 @@ export function fetchCourseSectionQuery(sectionId) {
     dispatch(updateFetchSectionLoadingStatus({ status: RequestStatus.IN_PROGRESS }));
 
     try {
-      const data = await getCourseSection(sectionId);
+      const data = await getCourseItem(sectionId);
       dispatch(updateSectionList(data));
       dispatch(updateFetchSectionLoadingStatus({ status: RequestStatus.SUCCESSFUL }));
     } catch (error) {
@@ -158,13 +161,13 @@ export function updateCourseSectionHighlightsQuery(sectionId, highlights) {
   };
 }
 
-export function publishCourseSectionQuery(sectionId) {
+export function publishCourseItemQuery(itemId, sectionId) {
   return async (dispatch) => {
     dispatch(updateSavingStatus({ status: RequestStatus.PENDING }));
     dispatch(showProcessingNotification(NOTIFICATION_MESSAGES.saving));
 
     try {
-      await publishCourseSection(sectionId).then(async (result) => {
+      await publishCourseSection(itemId).then(async (result) => {
         if (result) {
           await dispatch(fetchCourseSectionQuery(sectionId));
           dispatch(hideProcessingNotification());
@@ -198,13 +201,13 @@ export function configureCourseSectionQuery(sectionId, isVisibleToStaffOnly, sta
   };
 }
 
-export function editCourseSectionQuery(sectionId, displayName) {
+export function editCourseItemQuery(itemId, sectionId, displayName) {
   return async (dispatch) => {
     dispatch(updateSavingStatus({ status: RequestStatus.PENDING }));
     dispatch(showProcessingNotification(NOTIFICATION_MESSAGES.saving));
 
     try {
-      await editCourseSection(sectionId, displayName).then(async (result) => {
+      await editItemDisplayName(itemId, displayName).then(async (result) => {
         if (result) {
           await dispatch(fetchCourseSectionQuery(sectionId));
           dispatch(hideProcessingNotification());
@@ -218,14 +221,20 @@ export function editCourseSectionQuery(sectionId, displayName) {
   };
 }
 
-export function deleteCourseSectionQuery(sectionId) {
+/**
+ * Generic function to delete course item, see below wrapper funcs for specific implementations.
+ * @param {string} itemId
+ * @param {() => {}} deleteItemFn
+ * @returns {}
+ */
+function deleteCourseItemQuery(itemId, deleteItemFn) {
   return async (dispatch) => {
     dispatch(updateSavingStatus({ status: RequestStatus.PENDING }));
     dispatch(showProcessingNotification(NOTIFICATION_MESSAGES.deleting));
 
     try {
-      await deleteCourseSection(sectionId);
-      dispatch(deleteSection(sectionId));
+      await deleteCourseItem(itemId);
+      dispatch(deleteItemFn());
       dispatch(hideProcessingNotification());
       dispatch(updateSavingStatus({ status: RequestStatus.SUCCESSFUL }));
     } catch (error) {
@@ -235,16 +244,49 @@ export function deleteCourseSectionQuery(sectionId) {
   };
 }
 
-export function duplicateCourseSectionQuery(sectionId, courseBlockId) {
+export function deleteCourseSectionQuery(sectionId) {
+  return async (dispatch) => {
+    dispatch(deleteCourseItemQuery(
+      sectionId,
+      () => deleteSection({ itemId: sectionId }),
+    ));
+  };
+}
+
+export function deleteCourseSubsectionQuery(subsectionId, sectionId) {
+  return async (dispatch) => {
+    dispatch(deleteCourseItemQuery(
+      subsectionId,
+      () => deleteSubsection({ itemId: subsectionId, sectionId }),
+    ));
+  };
+}
+
+export function deleteCourseUnitQuery(unitId, subsectionId, sectionId) {
+  return async (dispatch) => {
+    dispatch(deleteCourseItemQuery(
+      unitId,
+      () => deleteUnit({ itemId: unitId, subsectionId, sectionId }),
+    ));
+  };
+}
+
+/**
+ * Generic function to duplicate any course item. See wrapper functions below for specific implementations.
+ * @param {string} itemId
+ * @param {string} parentLocator
+ * @param {(locator) => Promise<any>} duplicateFn
+ * @returns {}
+ */
+function duplicateCourseItemQuery(itemId, parentLocator, duplicateFn) {
   return async (dispatch) => {
     dispatch(updateSavingStatus({ status: RequestStatus.PENDING }));
     dispatch(showProcessingNotification(NOTIFICATION_MESSAGES.saving));
 
     try {
-      await duplicateCourseSection(sectionId, courseBlockId).then(async (result) => {
+      await duplicateCourseItem(itemId, parentLocator).then(async (result) => {
         if (result) {
-          const duplicatedSection = await getCourseSection(result.locator);
-          dispatch(duplicateSection({ id: sectionId, duplicatedSection }));
+          await duplicateFn(result.locator);
           dispatch(hideProcessingNotification());
           dispatch(updateSavingStatus({ status: RequestStatus.SUCCESSFUL }));
         }
@@ -256,20 +298,51 @@ export function duplicateCourseSectionQuery(sectionId, courseBlockId) {
   };
 }
 
-export function addNewCourseSectionQuery(courseBlockId) {
+export function duplicateSectionQuery(sectionId, courseBlockId) {
+  return async (dispatch) => {
+    dispatch(duplicateCourseItemQuery(
+      sectionId,
+      courseBlockId,
+      async (locator) => {
+        const duplicatedItem = await getCourseItem(locator);
+        dispatch(duplicateSection({ id: sectionId, duplicatedItem }));
+      },
+    ));
+  };
+}
+
+export function duplicateSubsectionQuery(subsectionId, sectionId) {
+  return async (dispatch) => {
+    dispatch(duplicateCourseItemQuery(
+      subsectionId,
+      sectionId,
+      async () => dispatch(fetchCourseSectionQuery(sectionId)),
+    ));
+  };
+}
+
+/**
+ * Generic function to add any course item. See wrapper functions below for specific implementations.
+ * @param {string} parentLocator
+ * @param {string} category
+ * @param {string} displayName
+ * @param {(data) => {}} addItemFn
+ * @returns {}
+ */
+function addNewCourseItemQuery(parentLocator, category, displayName, addItemFn) {
   return async (dispatch) => {
     dispatch(updateSavingStatus({ status: RequestStatus.PENDING }));
     dispatch(showProcessingNotification(NOTIFICATION_MESSAGES.saving));
 
     try {
       await addNewCourseItem(
-        courseBlockId,
-        'chapter',
-        DEFAULT_NEW_DISPLAY_NAMES.chapter,
+        parentLocator,
+        category,
+        displayName,
       ).then(async (result) => {
         if (result) {
-          const data = await getCourseSection(result.locator);
-          dispatch(addSection(data));
+          const data = await getCourseItem(result.locator);
+          dispatch(addItemFn(data));
           dispatch(updateSavingStatus({ status: RequestStatus.SUCCESSFUL }));
           dispatch(hideProcessingNotification());
         }
@@ -280,3 +353,25 @@ export function addNewCourseSectionQuery(courseBlockId) {
     }
   };
 }
+
+export function addNewSectionQuery(parentLocator) {
+  return async (dispatch) => {
+    dispatch(addNewCourseItemQuery(
+      parentLocator,
+      COURSE_BLOCK_NAMES.chapter.id,
+      COURSE_BLOCK_NAMES.chapter.name,
+      (data) => addSection(data),
+    ));
+  };
+}
+
+export function addNewSubsectionQuery(parentLocator) {
+  return async (dispatch) => {
+    dispatch(addNewCourseItemQuery(
+      parentLocator,
+      COURSE_BLOCK_NAMES.sequential.id,
+      COURSE_BLOCK_NAMES.sequential.name,
+      (data) => addSubsection({ parentLocator, data }),
+    ));
+  };
+}
diff --git a/src/course-outline/delete-modal/DeleteModal.jsx b/src/course-outline/delete-modal/DeleteModal.jsx
index 24f789d0d..a6c08fdee 100644
--- a/src/course-outline/delete-modal/DeleteModal.jsx
+++ b/src/course-outline/delete-modal/DeleteModal.jsx
@@ -5,16 +5,21 @@ import {
   Button,
   AlertModal,
 } from '@edx/paragon';
+import { useSelector } from 'react-redux';
 import { useIntl } from '@edx/frontend-platform/i18n';
 
+import { COURSE_BLOCK_NAMES } from '../constants';
+import { getCurrentItem } from '../data/selectors';
 import messages from './messages';
 
 const DeleteModal = ({ isOpen, close, onDeleteSubmit }) => {
   const intl = useIntl();
+  let { category } = useSelector(getCurrentItem);
+  category = COURSE_BLOCK_NAMES[category]?.name.toLowerCase();
 
   return (
     <AlertModal
-      title={intl.formatMessage(messages.title)}
+      title={intl.formatMessage(messages.title, { category })}
       isOpen={isOpen}
       onClose={close}
       footerNode={(
@@ -28,12 +33,12 @@ const DeleteModal = ({ isOpen, close, onDeleteSubmit }) => {
               onDeleteSubmit();
             }}
           >
-            {intl.formatMessage(messages.deleteButton)}
+            {intl.formatMessage(messages.deleteButton, { category })}
           </Button>
         </ActionRow>
       )}
     >
-      <p>{intl.formatMessage(messages.description)}</p>
+      <p>{intl.formatMessage(messages.description, { category })}</p>
     </AlertModal>
   );
 };
diff --git a/src/course-outline/delete-modal/DeleteModal.test.jsx b/src/course-outline/delete-modal/DeleteModal.test.jsx
index 5034eeae2..e03e4a4b8 100644
--- a/src/course-outline/delete-modal/DeleteModal.test.jsx
+++ b/src/course-outline/delete-modal/DeleteModal.test.jsx
@@ -1,25 +1,68 @@
 import React from 'react';
 import { render, fireEvent } from '@testing-library/react';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
+import { useSelector } from 'react-redux';
+import { initializeMockApp } from '@edx/frontend-platform';
+import MockAdapter from 'axios-mock-adapter';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import { AppProvider } from '@edx/frontend-platform/react';
 
+import initializeStore from '../../store';
 import DeleteModal from './DeleteModal';
 import messages from './messages';
 
+// eslint-disable-next-line no-unused-vars
+let axiosMock;
+let store;
+
 const onDeleteSubmitMock = jest.fn();
 const closeMock = jest.fn();
 
+jest.mock('react-redux', () => ({
+  ...jest.requireActual('react-redux'),
+  useSelector: jest.fn(),
+}));
+
+jest.mock('@edx/frontend-platform/i18n', () => ({
+  ...jest.requireActual('@edx/frontend-platform/i18n'),
+  useIntl: () => ({
+    formatMessage: (message) => message.defaultMessage,
+  }),
+}));
+
+const currentItemMock = {
+  displayName: 'Delete',
+};
+
 const renderComponent = (props) => render(
-  <IntlProvider locale="en">
-    <DeleteModal
-      isOpen
-      close={closeMock}
-      onDeleteSubmit={onDeleteSubmitMock}
-      {...props}
-    />
-  </IntlProvider>,
+  <AppProvider store={store}>
+    <IntlProvider locale="en">
+      <DeleteModal
+        isOpen
+        close={closeMock}
+        onDeleteSubmit={onDeleteSubmitMock}
+        {...props}
+      />
+    </IntlProvider>,
+  </AppProvider>,
 );
 
 describe('<DeleteModal />', () => {
+  beforeEach(() => {
+    initializeMockApp({
+      authenticatedUser: {
+        userId: 3,
+        username: 'abc123',
+        administrator: true,
+        roles: [],
+      },
+    });
+
+    store = initializeStore();
+    axiosMock = new MockAdapter(getAuthenticatedHttpClient());
+    useSelector.mockReturnValue(currentItemMock);
+  });
+
   it('render DeleteModal component correctly', () => {
     const { getByText, getByRole } = renderComponent();
 
diff --git a/src/course-outline/delete-modal/messages.js b/src/course-outline/delete-modal/messages.js
index f08eb8063..748120551 100644
--- a/src/course-outline/delete-modal/messages.js
+++ b/src/course-outline/delete-modal/messages.js
@@ -3,11 +3,11 @@ import { defineMessages } from '@edx/frontend-platform/i18n';
 const messages = defineMessages({
   title: {
     id: 'course-authoring.course-outline.delete-modal.title',
-    defaultMessage: 'Delete this section?',
+    defaultMessage: 'Delete this {category}?',
   },
   description: {
     id: 'course-authoring.course-outline.delete-modal.description',
-    defaultMessage: 'Deleting this section is permanent and cannot be undone.',
+    defaultMessage: 'Deleting this {category} is permanent and cannot be undone.',
   },
   deleteButton: {
     id: 'course-authoring.course-outline.delete-modal.button.delete',
diff --git a/src/course-outline/highlights-modal/HighlightsModal.test.jsx b/src/course-outline/highlights-modal/HighlightsModal.test.jsx
index 0cde160c4..0a767c2a6 100644
--- a/src/course-outline/highlights-modal/HighlightsModal.test.jsx
+++ b/src/course-outline/highlights-modal/HighlightsModal.test.jsx
@@ -36,7 +36,7 @@ jest.mock('../../help-urls/hooks', () => ({
   }),
 }));
 
-const currentSectionMock = {
+const currentItemMock = {
   highlights: ['Highlight 1', 'Highlight 2'],
   displayName: 'Test Section',
 };
@@ -69,13 +69,13 @@ describe('<HighlightsModal />', () => {
 
     store = initializeStore();
     axiosMock = new MockAdapter(getAuthenticatedHttpClient());
-    useSelector.mockReturnValue(currentSectionMock);
+    useSelector.mockReturnValue(currentItemMock);
   });
 
   it('renders HighlightsModal component correctly', () => {
     const { getByText, getByRole, getByLabelText } = renderComponent();
 
-    expect(getByText(`Highlights for ${currentSectionMock.displayName}`)).toBeInTheDocument();
+    expect(getByText(`Highlights for ${currentItemMock.displayName}`)).toBeInTheDocument();
     expect(getByText(/Enter 3-5 highlights to include in the email message that learners receive for this section/i)).toBeInTheDocument();
     expect(getByText(/For more information and an example of the email template, read our/i)).toBeInTheDocument();
     expect(getByText(messages.documentationLink.defaultMessage)).toBeInTheDocument();
diff --git a/src/course-outline/hooks.jsx b/src/course-outline/hooks.jsx
index 18eb443ed..857090d31 100644
--- a/src/course-outline/hooks.jsx
+++ b/src/course-outline/hooks.jsx
@@ -3,7 +3,9 @@ import { useDispatch, useSelector } from 'react-redux';
 import { useToggle } from '@edx/paragon';
 
 import { RequestStatus } from '../data/constants';
+import { COURSE_BLOCK_NAMES } from './constants';
 import {
+  setCurrentItem,
   setCurrentSection,
   updateSavingStatus,
 } from './data/slice';
@@ -13,19 +15,25 @@ import {
   getSavingStatus,
   getStatusBarData,
   getSectionsList,
+  getCurrentItem,
   getCurrentSection,
+  getCurrentSubsection,
 } from './data/selectors';
 import {
-  addNewCourseSectionQuery,
+  addNewSectionQuery,
+  addNewSubsectionQuery,
   deleteCourseSectionQuery,
-  editCourseSectionQuery,
-  duplicateCourseSectionQuery,
+  deleteCourseSubsectionQuery,
+  deleteCourseUnitQuery,
+  editCourseItemQuery,
+  duplicateSectionQuery,
+  duplicateSubsectionQuery,
   enableCourseHighlightsEmailsQuery,
   fetchCourseBestPracticesQuery,
   fetchCourseLaunchQuery,
   fetchCourseOutlineIndexQuery,
   fetchCourseReindexQuery,
-  publishCourseSectionQuery,
+  publishCourseItemQuery,
   updateCourseSectionHighlightsQuery,
   configureCourseSectionQuery,
 } from './data/thunk';
@@ -38,7 +46,9 @@ const useCourseOutline = ({ courseId }) => {
   const statusBarData = useSelector(getStatusBarData);
   const savingStatus = useSelector(getSavingStatus);
   const sectionsList = useSelector(getSectionsList);
+  const currentItem = useSelector(getCurrentItem);
   const currentSection = useSelector(getCurrentSection);
+  const currentSubsection = useSelector(getCurrentSubsection);
 
   const [isEnableHighlightsModalOpen, openEnableHighlightsModal, closeEnableHighlightsModal] = useToggle(false);
   const [isSectionsExpanded, setSectionsExpanded] = useState(true);
@@ -51,7 +61,11 @@ const useCourseOutline = ({ courseId }) => {
   const [isDeleteModalOpen, openDeleteModal, closeDeleteModal] = useToggle(false);
 
   const handleNewSectionSubmit = () => {
-    dispatch(addNewCourseSectionQuery(courseStructure.id));
+    dispatch(addNewSectionQuery(courseStructure.id));
+  };
+
+  const handleNewSubsectionSubmit = (sectionId) => {
+    dispatch(addNewSubsectionQuery(sectionId));
   };
 
   const headerNavigationsActions = {
@@ -81,19 +95,20 @@ const useCourseOutline = ({ courseId }) => {
   };
 
   const handleOpenHighlightsModal = (section) => {
+    dispatch(setCurrentItem(section));
     dispatch(setCurrentSection(section));
     openHighlightsModal();
   };
 
   const handleHighlightsFormSubmit = (highlights) => {
     const dataToSend = Object.values(highlights).filter(Boolean);
-    dispatch(updateCourseSectionHighlightsQuery(currentSection.id, dataToSend));
+    dispatch(updateCourseSectionHighlightsQuery(currentItem.id, dataToSend));
 
     closeHighlightsModal();
   };
 
-  const handlePublishSectionSubmit = () => {
-    dispatch(publishCourseSectionQuery(currentSection.id));
+  const handlePublishItemSubmit = () => {
+    dispatch(publishCourseItemQuery(currentItem.id, currentSection.id));
 
     closePublishModal();
   };
@@ -104,17 +119,37 @@ const useCourseOutline = ({ courseId }) => {
     closeConfigureModal();
   };
 
-  const handleEditSectionSubmit = (sectionId, displayName) => {
-    dispatch(editCourseSectionQuery(sectionId, displayName));
+  const handleEditSubmit = (itemId, sectionId, displayName) => {
+    dispatch(editCourseItemQuery(itemId, sectionId, displayName));
   };
 
-  const handleDeleteSectionSubmit = () => {
-    dispatch(deleteCourseSectionQuery(currentSection.id));
+  const handleDeleteItemSubmit = () => {
+    switch (currentItem.category) {
+    case COURSE_BLOCK_NAMES.chapter.id:
+      dispatch(deleteCourseSectionQuery(currentItem.id));
+      break;
+    case COURSE_BLOCK_NAMES.sequential.id:
+      dispatch(deleteCourseSubsectionQuery(currentItem.id, currentSection.id));
+      break;
+    case COURSE_BLOCK_NAMES.vertical.id:
+      dispatch(deleteCourseUnitQuery(
+        currentItem.id,
+        currentSubsection.id,
+        currentSection.id,
+      ));
+      break;
+    default:
+      return;
+    }
     closeDeleteModal();
   };
 
   const handleDuplicateSectionSubmit = () => {
-    dispatch(duplicateCourseSectionQuery(currentSection.id, courseStructure.id));
+    dispatch(duplicateSectionQuery(currentSection.id, courseStructure.id));
+  };
+
+  const handleDuplicateSubsectionSubmit = () => {
+    dispatch(duplicateSubsectionQuery(currentSubsection.id, currentSection.id));
   };
 
   useEffect(() => {
@@ -151,9 +186,9 @@ const useCourseOutline = ({ courseId }) => {
     headerNavigationsActions,
     handleEnableHighlightsSubmit,
     handleHighlightsFormSubmit,
-    handlePublishSectionSubmit,
     handleConfigureSectionSubmit,
-    handleEditSectionSubmit,
+    handlePublishItemSubmit,
+    handleEditSubmit,
     statusBarData,
     isEnableHighlightsModalOpen,
     openEnableHighlightsModal,
@@ -167,9 +202,11 @@ const useCourseOutline = ({ courseId }) => {
     isDeleteModalOpen,
     closeDeleteModal,
     openDeleteModal,
-    handleDeleteSectionSubmit,
+    handleDeleteItemSubmit,
     handleDuplicateSectionSubmit,
+    handleDuplicateSubsectionSubmit,
     handleNewSectionSubmit,
+    handleNewSubsectionSubmit,
   };
 };
 
diff --git a/src/course-outline/publish-modal/PublishModal.jsx b/src/course-outline/publish-modal/PublishModal.jsx
index 00c3f19f3..b6d33ea25 100644
--- a/src/course-outline/publish-modal/PublishModal.jsx
+++ b/src/course-outline/publish-modal/PublishModal.jsx
@@ -9,7 +9,7 @@ import {
 } from '@edx/paragon';
 import { useSelector } from 'react-redux';
 
-import { getCurrentSection } from '../data/selectors';
+import { getCurrentItem } from '../data/selectors';
 import messages from './messages';
 
 const PublishModal = ({
@@ -18,8 +18,8 @@ const PublishModal = ({
   onPublishSubmit,
 }) => {
   const intl = useIntl();
-  const { displayName, childInfo } = useSelector(getCurrentSection);
-  const subSections = childInfo?.children || [];
+  const { displayName, childInfo, category } = useSelector(getCurrentItem);
+  const children = childInfo?.children || [];
 
   return (
     <ModalDialog
@@ -35,23 +35,31 @@ const PublishModal = ({
         </ModalDialog.Title>
       </ModalDialog.Header>
       <ModalDialog.Body>
-        <p className="small">{intl.formatMessage(messages.description)}</p>
-        {subSections.filter(subSection => subSection.hasChanges).map((subSection) => {
-          const units = subSection.childInfo.children.filter(unit => unit.hasChanges);
+        <p className="small">{intl.formatMessage(messages.description, { category })}</p>
+        {children.filter(child => child.hasChanges).map((child) => {
+          let grandChildren = child.childInfo?.children || [];
+          grandChildren = grandChildren.filter(grandChild => grandChild.hasChanges);
 
-          return units.length ? (
-            <React.Fragment key={subSection.id}>
-              <span className="small text-gray-400">{subSection.displayName}</span>
-              {units.map((unit) => (
+          return grandChildren.length ? (
+            <React.Fragment key={child.id}>
+              <span className="small text-gray-400">{child.displayName}</span>
+              {grandChildren.map((grandChild) => (
                 <div
-                  key={unit.id}
+                  key={grandChild.id}
                   className="small border border-light-400 p-2 publish-modal__subsection"
                 >
-                  {unit.displayName}
+                  {grandChild.displayName}
                 </div>
               ))}
             </React.Fragment>
-          ) : null;
+          ) : (
+            <div
+              key={child.id}
+              className="small border border-light-400 p-2 publish-modal__subsection"
+            >
+              {child.displayName}
+            </div>
+          );
         })}
       </ModalDialog.Body>
       <ModalDialog.Footer className="pt-1">
diff --git a/src/course-outline/publish-modal/PublishModal.test.jsx b/src/course-outline/publish-modal/PublishModal.test.jsx
index 6dfdbc708..9c47a84c7 100644
--- a/src/course-outline/publish-modal/PublishModal.test.jsx
+++ b/src/course-outline/publish-modal/PublishModal.test.jsx
@@ -14,21 +14,20 @@ import messages from './messages';
 // eslint-disable-next-line no-unused-vars
 let axiosMock;
 let store;
-const mockPathname = '/foo-bar';
 
 jest.mock('react-redux', () => ({
   ...jest.requireActual('react-redux'),
   useSelector: jest.fn(),
 }));
 
-jest.mock('react-router-dom', () => ({
-  ...jest.requireActual('react-router-dom'),
-  useLocation: () => ({
-    pathname: mockPathname,
+jest.mock('@edx/frontend-platform/i18n', () => ({
+  ...jest.requireActual('@edx/frontend-platform/i18n'),
+  useIntl: () => ({
+    formatMessage: (message) => message.defaultMessage,
   }),
 }));
 
-const currentSectionMock = {
+const currentItemMock = {
   displayName: 'Publish',
   childInfo: {
     displayName: 'Subsection',
@@ -102,13 +101,13 @@ describe('<PublishModal />', () => {
 
     store = initializeStore();
     axiosMock = new MockAdapter(getAuthenticatedHttpClient());
-    useSelector.mockReturnValue(currentSectionMock);
+    useSelector.mockReturnValue(currentItemMock);
   });
 
   it('renders PublishModal component correctly', () => {
     const { getByText, getByRole, queryByText } = renderComponent();
 
-    expect(getByText(`Publish ${currentSectionMock.displayName}`)).toBeInTheDocument();
+    expect(getByText(messages.title.defaultMessage)).toBeInTheDocument();
     expect(getByText(messages.description.defaultMessage)).toBeInTheDocument();
     expect(getByText(/Subsection 1/i)).toBeInTheDocument();
     expect(getByText(/Subsection_1 Unit 1/i)).toBeInTheDocument();
diff --git a/src/course-outline/publish-modal/messages.js b/src/course-outline/publish-modal/messages.js
index 4db16bf63..7ea14a73b 100644
--- a/src/course-outline/publish-modal/messages.js
+++ b/src/course-outline/publish-modal/messages.js
@@ -7,7 +7,7 @@ const messages = defineMessages({
   },
   description: {
     id: 'course-authoring.course-outline.publish-modal.description',
-    defaultMessage: 'Publish all unpublished changes for this section?',
+    defaultMessage: 'Publish all unpublished changes for this {category}?',
   },
   cancelButton: {
     id: 'course-authoring.course-outline.publish-modal.button.cancel',
diff --git a/src/course-outline/section-card/SectionCard.jsx b/src/course-outline/section-card/SectionCard.jsx
index 55c8f0043..4612e85c9 100644
--- a/src/course-outline/section-card/SectionCard.jsx
+++ b/src/course-outline/section-card/SectionCard.jsx
@@ -1,5 +1,4 @@
 import {
-  React,
   forwardRef,
   useEffect,
   useState,
@@ -10,10 +9,10 @@ import { useIntl } from '@edx/frontend-platform/i18n';
 import { Badge, Button, useToggle } from '@edx/paragon';
 import { Add as IconAdd } from '@edx/paragon/icons';
 
-import { setCurrentSection } from '../data/slice';
+import { setCurrentItem, setCurrentSection } from '../data/slice';
 import { RequestStatus } from '../../data/constants';
 import CardHeader from '../card-header/CardHeader';
-import { getSectionStatus } from '../utils';
+import { getItemStatus } from '../utils';
 import messages from './messages';
 
 const SectionCard = forwardRef(({
@@ -27,6 +26,7 @@ const SectionCard = forwardRef(({
   onOpenDeleteModal,
   onDuplicateSubmit,
   isSectionsExpanded,
+  onNewSubsectionSubmit,
 }, lastItemRef) => {
   const intl = useIntl();
   const dispatch = useDispatch();
@@ -49,7 +49,7 @@ const SectionCard = forwardRef(({
     highlights,
   } = section;
 
-  const sectionStatus = getSectionStatus({
+  const sectionStatus = getItemStatus({
     published,
     releasedToStudents,
     visibleToStaffOnly,
@@ -62,12 +62,14 @@ const SectionCard = forwardRef(({
   };
 
   const handleClickMenuButton = () => {
+    dispatch(setCurrentItem(section));
     dispatch(setCurrentSection(section));
   };
 
   const handleEditSubmit = (titleValue) => {
     if (displayName !== titleValue) {
-      onEditSectionSubmit(id, titleValue);
+      // both itemId and sectionId are same
+      onEditSectionSubmit(id, id, titleValue);
       return;
     }
 
@@ -78,6 +80,10 @@ const SectionCard = forwardRef(({
     onOpenHighlightsModal(section);
   };
 
+  const handleNewSubsectionSubmit = () => {
+    onNewSubsectionSubmit(id);
+  };
+
   useEffect(() => {
     if (savingStatus === RequestStatus.SUCCESSFUL) {
       closeForm();
@@ -89,7 +95,7 @@ const SectionCard = forwardRef(({
       <CardHeader
         sectionId={id}
         title={displayName}
-        sectionStatus={sectionStatus}
+        status={sectionStatus}
         hasChanges={hasChanges}
         isExpanded={isExpanded}
         onExpand={handleExpandContent}
@@ -103,6 +109,7 @@ const SectionCard = forwardRef(({
         onEditSubmit={handleEditSubmit}
         isDisabledEditField={savingStatus === RequestStatus.IN_PROGRESS}
         onClickDuplicate={onDuplicateSubmit}
+        namePrefix="section"
       />
       <div className="section-card__content" data-testid="section-card__content">
         <div className="outline-section__status">
@@ -118,20 +125,21 @@ const SectionCard = forwardRef(({
         </div>
       </div>
       {isExpanded && (
-        <div data-testid="section-card__subsections" className="section-card__subsections">
-          {children}
-        </div>
-      )}
-      {isExpanded && (
-        <Button
-          data-testid="new-subsection-button"
-          className="mt-4"
-          variant="outline-primary"
-          iconBefore={IconAdd}
-          block
-        >
-          {intl.formatMessage(messages.newSubsectionButton)}
-        </Button>
+        <>
+          <div data-testid="section-card__subsections" className="section-card__subsections">
+            {children}
+          </div>
+          <Button
+            data-testid="new-subsection-button"
+            className="mt-4"
+            variant="outline-primary"
+            iconBefore={IconAdd}
+            block
+            onClick={handleNewSubsectionSubmit}
+          >
+            {intl.formatMessage(messages.newSubsectionButton)}
+          </Button>
+        </>
       )}
     </div>
   );
@@ -162,6 +170,7 @@ SectionCard.propTypes = {
   onOpenDeleteModal: PropTypes.func.isRequired,
   onDuplicateSubmit: PropTypes.func.isRequired,
   isSectionsExpanded: PropTypes.bool.isRequired,
+  onNewSubsectionSubmit: PropTypes.func.isRequired,
 };
 
 export default SectionCard;
diff --git a/src/course-outline/section-card/SectionCard.scss b/src/course-outline/section-card/SectionCard.scss
index 28cd17676..40c05810e 100644
--- a/src/course-outline/section-card/SectionCard.scss
+++ b/src/course-outline/section-card/SectionCard.scss
@@ -10,6 +10,18 @@
     margin-top: $spacer;
   }
 
+  .section-card__subsections {
+    margin-top: $spacer;
+  }
+
+  .section-card-title {
+    font-size: $h3-font-size;
+    font-family: $headings-font-family;
+    font-weight: $headings-font-weight;
+    line-height: $headings-line-height;
+    color: $headings-color;
+  }
+
   .section-card__highlights {
     display: flex;
     align-items: center;
diff --git a/src/course-outline/section-card/SectionCard.test.jsx b/src/course-outline/section-card/SectionCard.test.jsx
index ab3c00028..682bd2ebe 100644
--- a/src/course-outline/section-card/SectionCard.test.jsx
+++ b/src/course-outline/section-card/SectionCard.test.jsx
@@ -38,6 +38,7 @@ const renderComponent = (props) => render(
         onEditSectionSubmit={jest.fn()}
         onDuplicateSubmit={jest.fn()}
         isSectionsExpanded
+        namePrefix="section"
         {...props}
       >
         <span>children</span>
diff --git a/src/course-outline/subsection-card/SubsectionCard.jsx b/src/course-outline/subsection-card/SubsectionCard.jsx
new file mode 100644
index 000000000..817a9053a
--- /dev/null
+++ b/src/course-outline/subsection-card/SubsectionCard.jsx
@@ -0,0 +1,145 @@
+import { forwardRef, useEffect, useState } from 'react';
+import PropTypes from 'prop-types';
+import { useDispatch } from 'react-redux';
+import { useIntl } from '@edx/frontend-platform/i18n';
+import { Button, useToggle } from '@edx/paragon';
+import { Add as IconAdd } from '@edx/paragon/icons';
+
+import { setCurrentItem, setCurrentSection, setCurrentSubsection } from '../data/slice';
+import { RequestStatus } from '../../data/constants';
+import CardHeader from '../card-header/CardHeader';
+import { getItemStatus } from '../utils';
+import messages from './messages';
+
+const SubsectionCard = forwardRef(({
+  section,
+  subsection,
+  children,
+  onOpenPublishModal,
+  onEditSubmit,
+  savingStatus,
+  onOpenDeleteModal,
+  onDuplicateSubmit,
+}, lastItemRef) => {
+  const intl = useIntl();
+  const dispatch = useDispatch();
+  const [isExpanded, setIsExpanded] = useState(false);
+  const [isFormOpen, openForm, closeForm] = useToggle(false);
+
+  const {
+    id,
+    displayName,
+    hasChanges,
+    published,
+    releasedToStudents,
+    visibleToStaffOnly = false,
+    visibilityState,
+    staffOnlyMessage,
+  } = subsection;
+
+  const subsectionStatus = getItemStatus({
+    published,
+    releasedToStudents,
+    visibleToStaffOnly,
+    visibilityState,
+    staffOnlyMessage,
+  });
+
+  const handleExpandContent = () => {
+    setIsExpanded((prevState) => !prevState);
+  };
+
+  const handleClickMenuButton = () => {
+    dispatch(setCurrentSection(section));
+    dispatch(setCurrentSubsection(subsection));
+    dispatch(setCurrentItem(subsection));
+  };
+
+  const handleEditSubmit = (titleValue) => {
+    if (displayName !== titleValue) {
+      onEditSubmit(id, section.id, titleValue);
+      return;
+    }
+
+    closeForm();
+  };
+
+  useEffect(() => {
+    if (savingStatus === RequestStatus.SUCCESSFUL) {
+      closeForm();
+    }
+  }, [savingStatus]);
+
+  return (
+    <div className="subsection-card" data-testid="subsection-card" ref={lastItemRef}>
+      <CardHeader
+        title={displayName}
+        status={subsectionStatus}
+        hasChanges={hasChanges}
+        isExpanded={isExpanded}
+        onExpand={handleExpandContent}
+        onClickMenuButton={handleClickMenuButton}
+        onClickPublish={onOpenPublishModal}
+        onClickEdit={openForm}
+        onClickDelete={onOpenDeleteModal}
+        isFormOpen={isFormOpen}
+        closeForm={closeForm}
+        onEditSubmit={handleEditSubmit}
+        isDisabledEditField={savingStatus === RequestStatus.IN_PROGRESS}
+        onClickDuplicate={onDuplicateSubmit}
+        namePrefix="subsection"
+      />
+      {isExpanded && (
+        <>
+          <div data-testid="subsection-card__units" className="subsection-card__units">
+            {children}
+          </div>
+          <Button
+            data-testid="new-unit-button"
+            className="mt-4"
+            variant="outline-primary"
+            iconBefore={IconAdd}
+            block
+          >
+            {intl.formatMessage(messages.newUnitButton)}
+          </Button>
+        </>
+      )}
+    </div>
+  );
+});
+
+SubsectionCard.defaultProps = {
+  children: null,
+};
+
+SubsectionCard.propTypes = {
+  section: PropTypes.shape({
+    id: PropTypes.string.isRequired,
+    displayName: PropTypes.string.isRequired,
+    published: PropTypes.bool.isRequired,
+    hasChanges: PropTypes.bool.isRequired,
+    releasedToStudents: PropTypes.bool.isRequired,
+    visibleToStaffOnly: PropTypes.bool,
+    visibilityState: PropTypes.string.isRequired,
+    staffOnlyMessage: PropTypes.bool.isRequired,
+  }).isRequired,
+  subsection: PropTypes.shape({
+    id: PropTypes.string.isRequired,
+    displayName: PropTypes.string.isRequired,
+    published: PropTypes.bool.isRequired,
+    hasChanges: PropTypes.bool.isRequired,
+    releasedToStudents: PropTypes.bool.isRequired,
+    visibleToStaffOnly: PropTypes.bool,
+    visibilityState: PropTypes.string.isRequired,
+    staffOnlyMessage: PropTypes.bool.isRequired,
+  }).isRequired,
+  children: PropTypes.node,
+  onOpenPublishModal: PropTypes.func.isRequired,
+  onEditSubmit: PropTypes.func.isRequired,
+  savingStatus: PropTypes.string.isRequired,
+  onOpenDeleteModal: PropTypes.func.isRequired,
+  onDuplicateSubmit: PropTypes.func.isRequired,
+};
+
+export default SubsectionCard;
diff --git a/src/course-outline/subsection-card/SubsectionCard.scss b/src/course-outline/subsection-card/SubsectionCard.scss
new file mode 100644
index 000000000..adb64fc47
--- /dev/null
+++ b/src/course-outline/subsection-card/SubsectionCard.scss
@@ -0,0 +1,20 @@
+.subsection-card {
+  @include pgn-box-shadow(1, "centered");
+
+  padding: $spacer 2rem;
+  cursor: move;
+  margin-bottom: 1.5rem;
+
+  .subsection-card__content {
+    margin: $spacer;
+  }
+
+
+  .subsection-card-title {
+    font-size: $h4-font-size;
+    font-family: $headings-font-family;
+    font-weight: $headings-font-weight;
+    line-height: $headings-line-height;
+    color: $headings-color;
+  }
+}
diff --git a/src/course-outline/subsection-card/SubsectionCard.test.jsx b/src/course-outline/subsection-card/SubsectionCard.test.jsx
new file mode 100644
index 000000000..4be624736
--- /dev/null
+++ b/src/course-outline/subsection-card/SubsectionCard.test.jsx
@@ -0,0 +1,81 @@
+import React from 'react';
+import { render, fireEvent } from '@testing-library/react';
+import { IntlProvider } from '@edx/frontend-platform/i18n';
+import { AppProvider } from '@edx/frontend-platform/react';
+import { initializeMockApp } from '@edx/frontend-platform';
+import MockAdapter from 'axios-mock-adapter';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+
+import initializeStore from '../../store';
+import SubsectionCard from './SubsectionCard';
+
+// eslint-disable-next-line no-unused-vars
+let axiosMock;
+let store;
+
+const subsection = {
+  id: '123',
+  displayName: 'Subsection Name',
+  published: true,
+  releasedToStudents: true,
+  visibleToStaffOnly: false,
+  visibilityState: 'visible',
+  staffOnlyMessage: false,
+  hasChanges: false,
+};
+
+const renderComponent = (props) => render(
+  <AppProvider store={store}>
+    <IntlProvider locale="en">
+      <SubsectionCard
+        subsection={subsection}
+        onOpenPublishModal={jest.fn()}
+        onOpenHighlightsModal={jest.fn()}
+        onOpenDeleteModal={jest.fn()}
+        onEditClick={jest.fn()}
+        savingStatus=""
+        onEditSubmit={jest.fn()}
+        onDuplicateSubmit={jest.fn()}
+        namePrefix="subsection"
+        {...props}
+      >
+        <span>children</span>
+      </SubsectionCard>
+    </IntlProvider>,
+  </AppProvider>,
+);
+
+describe('<SubsectionCard />', () => {
+  beforeEach(() => {
+    initializeMockApp({
+      authenticatedUser: {
+        userId: 3,
+        username: 'abc123',
+        administrator: true,
+        roles: [],
+      },
+    });
+
+    store = initializeStore();
+    axiosMock = new MockAdapter(getAuthenticatedHttpClient());
+  });
+
+  it('render SubsectionCard component correctly', () => {
+    const { getByTestId } = renderComponent();
+
+    expect(getByTestId('subsection-card-header')).toBeInTheDocument();
+  });
+
+  it('expands/collapses the card when the subsection button is clicked', async () => {
+    const { queryByTestId, findByTestId } = renderComponent();
+
+    const expandButton = await findByTestId('subsection-card-header__expanded-btn');
+    fireEvent.click(expandButton);
+    expect(queryByTestId('subsection-card__units')).toBeInTheDocument();
+    expect(queryByTestId('new-unit-button')).toBeInTheDocument();
+
+    fireEvent.click(expandButton);
+    expect(queryByTestId('subsection-card__units')).not.toBeInTheDocument();
+    expect(queryByTestId('new-unit-button')).not.toBeInTheDocument();
+  });
+});
diff --git a/src/course-outline/subsection-card/messages.js b/src/course-outline/subsection-card/messages.js
new file mode 100644
index 000000000..90ca407b1
--- /dev/null
+++ b/src/course-outline/subsection-card/messages.js
@@ -0,0 +1,10 @@
+import { defineMessages } from '@edx/frontend-platform/i18n';
+
+const messages = defineMessages({
+  newUnitButton: {
+    id: 'course-authoring.course-outline.subsection.button.new-unit',
+    defaultMessage: 'New unit',
+  },
+});
+
+export default messages;
diff --git a/src/course-outline/utils.jsx b/src/course-outline/utils.jsx
index a1c73813e..29b049cf8 100644
--- a/src/course-outline/utils.jsx
+++ b/src/course-outline/utils.jsx
@@ -4,7 +4,7 @@ import {
   EditOutline as EditOutlineIcon,
 } from '@edx/paragon/icons';
 
-import { SECTION_BADGE_STATUTES, STAFF_ONLY } from './constants';
+import { ITEM_BADGE_STATUS, STAFF_ONLY } from './constants';
 
 /**
  * Get section status depended on section info
@@ -13,9 +13,9 @@ import { SECTION_BADGE_STATUTES, STAFF_ONLY } from './constants';
  * @param {bool} visibleToStaffOnly - value from section info
  * @param {string} visibilityState - value from section info
  * @param {bool} staffOnlyMessage - value from section info
- * @returns {SECTION_BADGE_STATUTES[keyof SECTION_BADGE_STATUTES]}
+ * @returns {ITEM_BADGE_STATUS[keyof ITEM_BADGE_STATUS]}
  */
-const getSectionStatus = ({
+const getItemStatus = ({
   published,
   releasedToStudents,
   visibleToStaffOnly,
@@ -24,13 +24,13 @@ const getSectionStatus = ({
 }) => {
   switch (true) {
   case published && releasedToStudents:
-    return SECTION_BADGE_STATUTES.live;
+    return ITEM_BADGE_STATUS.live;
   case published && !releasedToStudents:
-    return SECTION_BADGE_STATUTES.publishedNotLive;
+    return ITEM_BADGE_STATUS.publishedNotLive;
   case visibleToStaffOnly && staffOnlyMessage && visibilityState === STAFF_ONLY:
-    return SECTION_BADGE_STATUTES.staffOnly;
+    return ITEM_BADGE_STATUS.staffOnly;
   case !published:
-    return SECTION_BADGE_STATUTES.draft;
+    return ITEM_BADGE_STATUS.draft;
   default:
     return '';
   }
@@ -38,30 +38,30 @@ const getSectionStatus = ({
 
 /**
  * Get section badge status content
- * @param {string} status - value from on getSectionStatus util
+ * @param {string} status - value from on getItemStatus util
  * @returns {
  *   badgeTitle: string,
  *   badgeIcon: node,
  * }
  */
-const getSectionStatusBadgeContent = (status, messages, intl) => {
+const getItemStatusBadgeContent = (status, messages, intl) => {
   switch (status) {
-  case SECTION_BADGE_STATUTES.live:
+  case ITEM_BADGE_STATUS.live:
     return {
       badgeTitle: intl.formatMessage(messages.statusBadgeLive),
       badgeIcon: CheckCircleIcon,
     };
-  case SECTION_BADGE_STATUTES.publishedNotLive:
+  case ITEM_BADGE_STATUS.publishedNotLive:
     return {
       badgeTitle: intl.formatMessage(messages.statusBadgePublishedNotLive),
       badgeIcon: '',
     };
-  case SECTION_BADGE_STATUTES.staffOnly:
+  case ITEM_BADGE_STATUS.staffOnly:
     return {
       badgeTitle: intl.formatMessage(messages.statusBadgeStaffOnly),
       badgeIcon: LockIcon,
     };
-  case SECTION_BADGE_STATUTES.draft:
+  case ITEM_BADGE_STATUS.draft:
     return {
       badgeTitle: intl.formatMessage(messages.statusBadgeDraft),
       badgeIcon: EditOutlineIcon,
@@ -110,12 +110,16 @@ const getHighlightsFormValues = (currentHighlights) => {
 };
 
 const scrollToElement = (ref) => {
-  ref.current?.scrollIntoView({ behavior: 'smooth' });
+  ref.current?.scrollIntoView({
+    block: 'end',
+    inline: 'nearest',
+    behavior: 'smooth',
+  });
 };
 
 export {
-  getSectionStatus,
-  getSectionStatusBadgeContent,
+  getItemStatus,
+  getItemStatusBadgeContent,
   getHighlightsFormValues,
   scrollToElement,
 };