I've got some interior cells some nice folks have built for me, and I'm trying to get them from the esp file they are in, to my main esp file. I can pull them up together in the CK and copy and paste the stuff into a new cell, but it doesn't seem to copy the navmesh. (Unless I'm doing something wrong.)

Do I need to be doing this in TESVedit, and if so, how? Sorry for such a noob question, but I've only done this with Tesnip.