A couple of examples of Bulk Deleting borrowers...
*** NOTE: Remember to BACKUP first in case you make a mistake and need to rewind the clock!
Deleting a whole Level of Students in bulk -
Steps...
If you want to change to remaining Level 12 borrowers to LEFT2010 then after purging the Level 12s with no loans you could do a bulk change of the remaining Level 12s to change their group to be LEFT2010.
To do this:-
and follow the prompts to complete the change...