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Since your sections are managed by J1, faculty cannot manually create sections, as it can interfere with the automated sync. However, faculty can absolutely use Student Groups to create a custom, "clutter-free" view of the Gradebook and SpeedGrader without touching the official SIS enrollment data.
Setup: Create a Group Set and Groups for students
- Create a Group Set on the People tab of your course, named something like "Assessment Tracks". Think of this as an over aching theme, not the individual group the student is part of.

- Create at least one Group inside the group set.

- Verify membership

Using Groups with Gradebook
Faculty can create a manual "Group Set" (e.g., "Instructor Assigned Groups") and add only the students they are responsible for to their own specific group.
- Go to Grades.
- Click the Apply Filters button and Select Student Groups from the list.
Choose the specific group (e.g., "Professor Smith's Students").
The Gradebook will now hide all other students, showing only that specific subset.
Using Groups with SpeedGrader
Once per course setup:
- Go to Settings > Course Details tab.
- Scroll down to Launch SpeedGrader Filtered by Student Group and check the box.

- Click Update Course Details button at bottom of page.
SpeedGrader will now respect he same filters as Gradebook.