I spent quite a bit of time working on a house mod only to find out that it was creating frequent CTDs when I was testing it. I believe it is because I messed with the 'wilderness' cell's navmesh. This is my first stab at this stuff, so I had already placed everything before I learned that messing with exterior cells is a no-no for beginners. urgh. Anyway, so I removed everything from the exterior cell and put the navmesh back to right (I think), but the mod still causes CTD. I thought I was being very careful to not use any vanilla stuff (duplicating to make my own), but I'm not sure it was the exterior cell that was causing the problem.... perhaps I accidentally changed something I shouldn't have. So, this brings me to my question.... using the CK, how can I take a portion of the mod (interior cells, containers, etc.) and move them to a new esp with a clean exterior?? Perhaps this is simple, but I've not been able to figure it out, and I really don't want to start all over if I don't have to. If I can be certain that the exterior is clean, then I can eliminate that as a source of my problem. I appreciate any help you veterans can offer.

One way to import your interior cell to a "fresh" esp, is load your "broken" mod esp as normal, except don't make it an active plugin. Then, rename your interior cell and save under a different name. Then deselect the old esp and open selecting the new one making it the active plugin as usual. There are other ways to do it, but that should do the trick.

That makes too much sense. I have no idea why that concept was beyond me, but THANK YOU.