is there a "delete" command in the Object Merger

The thing is: I want to create a test map that have a part of the script,object of my main map.

I export abilities from the main map -> import it to the test map then I want to delete some unnecessary abilities
when I attempt to do so, I got this crash:



I wonder if there is a "delete" command in the Object Merger?
if not, anyone has a solution for my problem?

I've encountered this too. God damn annoying.. You just need to delete a few then save. Gotta do it a lot depending on how many you want to delete/how often you delete one too many and we crashes.