If you are using UV mapper you can keep your object as a single model. Split your obj in to material groups_ for example 'columns' 'facade' 'walls' etc. Then select each material group in turn, hiding the other groups. The selected group can then be rescaled in UV mapper to take up the whole of your 4000x4000 pixel map (that's pretty large!)You can then save a seperate template map for each material group in turn remembering to tick the box that says don't include hidden facets. (Don't shift any of the bits once you've created the map)Once you created the template maps make everything visible. All the bits will overlap_ don't worry! Now resave your obj file. When you create your seperate texture maps you will have to apply them to the different material groups in poser in the materials set-up box. Hope that makes sense_ happy to enlarge if any of that needs qualification