I'm working on a quest mod that adds a Telvanni tower to Skyrim. As an experiment, I copied the Tel Mithryn interior as a template for the tower interior. There are all sorts of NPC's and scripting in that cell, so I decided it might be easier to build my interior from scratch. But deleting my copied interior caused the CK to crash. Likewise, trying to delete the cell data line by line in the data interface causes the CK to crash. I'm using assets from the Dragonborn.bsa, but I'm not trying to alter anything from Dragonborn.esm. What's the best way to get rid of the associations I don't want without causing the CK to crash?

Edit: Ugh, did I really spell Advice "Advise"? I do know my native language, truly!