When you create a model, paint each part that you want to belong to a certain group a different color. For example, if you create a chair, you could paint the legs red, the seat blue, the back green, the sides yellow, etc. Then, when you open your model in UVMapper, in the texture map you can right-click on an area of the chair and choose "Select Material" and select the material that belongs to that area. Now you can go to Tools/Assign To/Groups and you can type in a name for that group. Do this for all the areas and assign the groups. Save the object, and when you open it in Poser, it will have these groups. I hope this helps! :) Sue