Hey, this is great! O.K. take the .obj into uvmapper and after mapping it how you like go to your menue Edit/Select and you'll see you can select by group, by material , by region etc. After selecting the group you want it should be highlighted in red, go to Edit/Assign and assign it to new material, name it and do the same for the other group. Once this is done make sure you resave the .obj. If you like save it under a different name just to be safe and then take it into poser, it should have the different materials you assigned. Oh, and don't leave spaces in the material's names because if you try to save as a smart prop Poser will not recognize them. I had prepared a mini tut on this with pics so if you're still unclear let me know and I'll send it.