Hi ! I haven't tried building a prop from within Poser itself but I used 3DS MAX to build props , export them to OBJ format and then used UVMapper and PHIBuilder to make it posable in Poser (this result in a Character (CR2) file rather than a Prop (pp2) file) . Works well for rotating parts , I still have to figure out how to do sliding parts (other than parenting to the main part of the prop). I guess you could do the same from Poser by exporting the object to an OBJ file and going through UVMapper and PHIbuilder . There should be tutorials for Prop/figure building here and there is (or was) a good one at Poserworld . Both UVM and PHI are available from the Freestuff section. Take care.