From what I know, I'd say it probably depends. Most likely though, it uses different xmls for a good reason. For example, Multiple nifs might use the same floor.xml but use different "main" xmls. (Example Image) If I were to put the code from "Floor.xml" into "Matera.xml" and then delete the Floor.xml file, then the nif on the right would no longer have a Floor.xml to refer to. Edit: Also I'm not so sure that merging .xmls for HDT-PE would be as simple as copy-pasting it. There's possibly some ordering that needs to be done, as with HDT-SMP. So I guess it comes down to exactly what you're trying to modify and why. Personally I don't see any practical reason to merge .xmls, but if I wanted to merge them I would make sure to avoid inadvertently messing up another .nif's physics. The problem is SMP will not work with more than one XML...so I have no idea what to do. I know nothing about physics, so i wouldnt even know where to start, and why this armor has a piece of XML outside of the regular XML. I took a few pictures of the armor i'm trying to adapt: it's not like i have any other choice but merge, since i'm definitely not going to re-weightpaint it all just for an SE conversion. Don't really care if it won't be perfect, just trying to understand whatthis Pelvis.XML is for... My question is what exactly shouuld i do? try to merge them into one? just copy the info of the pelvs XML before i write my SMP xml?After?? ignore the Pevlis XML? What is this pelvis XML doing ingame to the armor?