Blackboard has an “additive approach” to importing course content — unlike ANGEL, if you import from an another LMS or another course, the process adds to what’s already in the course instead of replacing it.
So you may need to “blank out” an entire shell and start over with a fresh import from a Blackboard master. If that occurs, instead of just doing that input like in ANGEL, you’ll first need to use the Blackboard tool called Bulk Delete.
First, find the tool by looking under Control Panel > Packages and Utilities > Bulk Delete. Then select the materials you want to delete. “Content materials” refers to “content areas” or, in almost all MCC courses, the Lessons tab. Deleting this will wipe out everything under Lessons.
The other stuff is fairly self-explanatory. You could use this functionality to remove all announcements, say, if you wanted to start fresh.
In the confirmation area, you’ll just need to type in “Delete” and then click submit. That’s it!