A Little more info would probably get you some help. Pz3 files do not contain the separate .obj files. They call to external objects. For instance the boots you used are not in my library or in the same location as you have them stored so they don't load so I can see them. I get one Dork wearing pants and a shirt. We need to know what figures it is you want to merge into one. If it's the clothes and Dork, I think everyone is going to say why? My understanding to merge to figures together into one means you'll have to export both figures as one Wavefront Object then re-import the single object and re-bone and re-group the new object in the Poser Set Up Room or another compatible modeler.