https://help.blackboard.com/Learn/Instructor/Ultra/Grade/Navigate_Grading
About Deleting Grade Center Columns
When you create gradable items in your course, grade columns are created automatically in the Grade Center, including columns for:
- Tests, surveys, and Self and Peer Assessments
- Assignments and SafeAssignments
- Discussion posts
- Journal and blog entries
- Wiki contributions
To delete the gradebook column:
1. Log in to Blackboard and click into the Gradebook.
2. Locate the column you want to delete.
3. Click at the top of the column to open a menu, and then click delete:
(WARNING -- Deleting the Gradebook column for an item will also delete this item from the Content Area of the course)