Help please with editing models

[Dietre]

I use to mod M2tw ALOT and used milkshape. it was pretty easy to import a .mesh and merge some etc.
For R2tw, how would I take a helmet or whatever, separate off the cheek armor. Merging them with assembly kit would work, but combining them in milkshape to reduce any possible clipping would be better.

Im not bringing in brand new models, I just want to trim pieces off existing armor.

thanks for any help.

Bah, found the thread that people are still talking about in regards to exporting models. ill keep following that. this can be deleted by a mod please.