Ragdoll to NPC

Way back in GMod 9 wasn’t there a tool that you can switch a rag doll model with an npc model so that for example I have a combine soldier rag doll and I have a Kliener npc, and used the tool to switch bodies. Is that tool part of GMod or was it custom. I don’t remember, can anyone help?

I think it was the model manipulator, I may be wrong though. It’s a custom mod.