A CR2 file calling up an OBJ file containing body part grouping includes "Weld" lines in its script. Replacing body part with prop does not. The solution is to either write a hierarchy (PHI) file and bring the model into Poser that way or edit an existing CR2 to point to your model. Do this by opening a suitable CR2 file in a text editor. Then search for the two instances of the OBJ file path. Rewrite these for your new OBJ.