diff --git a/openedx/core/djangoapps/content/learning_sequences/api/outlines.py b/openedx/core/djangoapps/content/learning_sequences/api/outlines.py
index ffe2ac68e4..dd8358c621 100644
--- a/openedx/core/djangoapps/content/learning_sequences/api/outlines.py
+++ b/openedx/core/djangoapps/content/learning_sequences/api/outlines.py
@@ -561,6 +561,17 @@ def _update_user_partition_groups(upg_data: Dict[int, FrozenSet[int]],
                 )
                 model_obj.user_partition_groups.add(upg)
 
+    # Temporarily fill-in the new and old user_partition_group fields.
+    # Switchover to the new field will occur after all models have been repopulated.
+    model_obj.new_user_partition_groups.all().delete()
+    if upg_data:
+        for partition_id, group_ids in upg_data.items():
+            for group_id in group_ids:
+                upg, _ = UserPartitionGroup.objects.get_or_create(
+                    partition_id=partition_id, group_id=group_id
+                )
+                model_obj.new_user_partition_groups.add(upg)
+
 
 def _update_publish_report(course_outline: CourseOutlineData,
                            content_errors: List[ContentErrorData],
diff --git a/openedx/core/djangoapps/content/learning_sequences/migrations/0013_through_model_for_user_partition_groups_1.py b/openedx/core/djangoapps/content/learning_sequences/migrations/0013_through_model_for_user_partition_groups_1.py
new file mode 100644
index 0000000000..23ad1b0cf3
--- /dev/null
+++ b/openedx/core/djangoapps/content/learning_sequences/migrations/0013_through_model_for_user_partition_groups_1.py
@@ -0,0 +1,46 @@
+# Generated by Django 2.2.24 on 2021-06-14 22:04
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('learning_sequences', '0012_add_user_partition_group'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SectionSequencePartitionGroup',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('course_section_sequence', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='learning_sequences.CourseSectionSequence')),
+                ('user_partition_group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='learning_sequences.UserPartitionGroup')),
+            ],
+            options={
+                'unique_together': {('user_partition_group', 'course_section_sequence')},
+            },
+        ),
+        migrations.CreateModel(
+            name='SectionPartitionGroup',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('course_section', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='learning_sequences.CourseSection')),
+                ('user_partition_group', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='learning_sequences.UserPartitionGroup')),
+            ],
+            options={
+                'unique_together': {('user_partition_group', 'course_section')},
+            },
+        ),
+        migrations.AddField(
+            model_name='coursesection',
+            name='new_user_partition_groups',
+            field=models.ManyToManyField(db_index=True, related_name='sec_user_partition_groups', related_query_name='sec_user_partition_group', through='learning_sequences.SectionPartitionGroup', to='learning_sequences.UserPartitionGroup'),
+        ),
+        migrations.AddField(
+            model_name='coursesectionsequence',
+            name='new_user_partition_groups',
+            field=models.ManyToManyField(db_index=True, related_name='secseq_user_partition_groups', related_query_name='secseq_user_partition_group', through='learning_sequences.SectionSequencePartitionGroup', to='learning_sequences.UserPartitionGroup'),
+        ),
+    ]
diff --git a/openedx/core/djangoapps/content/learning_sequences/models.py b/openedx/core/djangoapps/content/learning_sequences/models.py
index df0912a9ba..ed7fae1f74 100644
--- a/openedx/core/djangoapps/content/learning_sequences/models.py
+++ b/openedx/core/djangoapps/content/learning_sequences/models.py
@@ -201,6 +201,14 @@ class CourseSection(CourseContentVisibilityMixin, TimeStampedModel):
 
     user_partition_groups = models.ManyToManyField(UserPartitionGroup)
 
+    new_user_partition_groups = models.ManyToManyField(
+        UserPartitionGroup,
+        db_index=True,
+        related_name='sec_user_partition_groups',
+        related_query_name='sec_user_partition_group',
+        through='SectionPartitionGroup'
+    )
+
     class Meta:
         unique_together = [
             ['course_context', 'usage_key'],
@@ -210,6 +218,22 @@ class CourseSection(CourseContentVisibilityMixin, TimeStampedModel):
         ]
 
 
+class SectionPartitionGroup(models.Model):
+    """
+    Model which maps user partition groups to course sections.
+    Used for the user_partition_groups ManyToManyField field in the CourseSection model above.
+    Adds a cascading delete which will delete these many-to-many relations
+    whenever a UserPartitionGroup or CourseSection object is deleted.
+    """
+    class Meta:
+        unique_together = [
+            ['user_partition_group', 'course_section'],
+        ]
+
+    user_partition_group = models.ForeignKey(UserPartitionGroup, on_delete=models.CASCADE)
+    course_section = models.ForeignKey(CourseSection, on_delete=models.CASCADE)
+
+
 class CourseSectionSequence(CourseContentVisibilityMixin, TimeStampedModel):
     """
     This is a join+ordering table, with entries that could get wiped out and
@@ -241,6 +265,14 @@ class CourseSectionSequence(CourseContentVisibilityMixin, TimeStampedModel):
 
     user_partition_groups = models.ManyToManyField(UserPartitionGroup)
 
+    new_user_partition_groups = models.ManyToManyField(
+        UserPartitionGroup,
+        db_index=True,
+        related_name='secseq_user_partition_groups',
+        related_query_name='secseq_user_partition_group',
+        through='SectionSequencePartitionGroup'
+    )
+
     class Meta:
         unique_together = [
             ['course_context', 'ordering'],
@@ -252,6 +284,22 @@ class CourseSectionSequence(CourseContentVisibilityMixin, TimeStampedModel):
         return f"{self.section.title} > {self.sequence.title}"
 
 
+class SectionSequencePartitionGroup(models.Model):
+    """
+    Model which maps user partition groups to course section sequences.
+    Used for the user_partition_groups ManyToManyField field in the CourseSectionSequence model above.
+    Adds a cascading delete which will delete these many-to-many relations
+    whenever a UserPartitionGroup or CourseSectionSequence object is deleted.
+    """
+    class Meta:
+        unique_together = [
+            ['user_partition_group', 'course_section_sequence'],
+        ]
+
+    user_partition_group = models.ForeignKey(UserPartitionGroup, on_delete=models.CASCADE)
+    course_section_sequence = models.ForeignKey(CourseSectionSequence, on_delete=models.CASCADE)
+
+
 class CourseSequenceExam(TimeStampedModel):
     """
     This model stores XBlock information that affects outline level information