I have a list of  Lookup IDs that have prospect manager assigned. I simply want to end ate the prospect manager. Short of manually opening each record one by one I can't seem to a find a way through global changes or imports to change existing prospect manager assignments. The closest I've been able to get is using the Manage Prospects and Assignments in Bulk functionality. But using that I would have to go line by line through all prospects assigned to this prospect manager, highlight their row, and unassign them. Not a great option when I'm end dating 100s of assignments.