There's very little difference between a material collection and a MAT Pose, just the filename and a little bit at the beginning. What you need to do is remove the material info that you don't want to change. A whole material is easy, even with a hand edit, and that would let you change the body texture without changing the head, for instance. More detailed trimming gets tricky. You need to retain the structure -- those nested brackets -- and the connections. I have several items which have partial MAT poses to add bumpmaps, but the whole structure of a P5 file is much more complicated... (Checks) Little_Dragon has done it for his Furrette 2 character. It looks obvious to me, but I'm not going to try to explain it...