You don't need to export anything from Poser to make maps. You should always use the original obj's from the geometries folder.

Load the original obj from the geometries folder (or wherever Poser 6 decided to put it), click [ on your keyboard to hide everything and Ctrl+M to show the material box. Select what materials you want to have on your map** and click OK. Go to File|Save Template (or Ctrl+T), and in the options be sure to select Exclude Hidden Facets. This makes sure that the parts you have hidden stay hidden on your map. Repeat this process for each map you need to make.

**On your head map you'd select things like SkinHead, Lips, Lacrimal, etc On your body map you'd select things like SkinLegs, SkinArms, etc.