...
Third-Party Assignment Still in an eCampus Course: If the instructor has not yet deleted the Turnitin assignment in a copied course, they need to open the assignment before deleting it otherwise, it will not delete the corresponding column in the Grade Center.
Third-Party Assignment Deleted from eCampus Course: If the instructor has deleted the Turnitin assignment they cannot delete the corresponding column from the Grade Center, but you can hide the grade column from the instructors' and students' view
Third-Party Assignment Deleted from eCampus Course: Submit a ticket to ITS and they will work with the eCampus vendor (Blackboard) to delete the columns.
...