In order to remove Assignment Types no longer needed they need to be inactivated. To inactivate a Assignment Type navigate to:
- onCampus > Settings > Assignment Types
- Click the Editing Pencil next to the Assignment Type you no longer want to be active
- Change the Active Yes to No
- Click Save
Users will no longer be able to add this assignment type to a new assignment, however inactivating this will not remove any Assignments already added to the Course with that Assignment Type.