I'd say UVmapper is the easiest, though you can certainly do it with the Poser group editor. Either way, make sure it's the obj file in the Geometries folder that you work on. If you want to keep a copy of the original version, then save the obj file with a new name, then open your cr2 and edit the two lines that point to the obj file. The deleted materials won't automatically remove themselves from the cr2 file, so you'll need to either just put up with it still listing a bunch of materials that aren't there or remove them yourself with a text editor. I find the easiest way is to load the cr2 in Poser then save it back to the library. This usually puts all of the unused materials at the end of the material list, after the preview material. Then you can get into the cr2 with a text editor and delete one continuous block starting at the material after preview and ending with the last material in the list.

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