Just load your prop then select it and go into the setup room. Click on the bone tool ( the one the orange hand is pointing to in the picture ) and draw a bone starting from the bottom of the prop to the top so that the bone looks something like the picture. Then click on the grouping tool (the green hand is pointing to that). Click on new group then click ok then click on add all then click on autogroup. Then select the part with the name newgroup and delete that. Then leave the setup room and save your figure in the figure library somewhere. Uvmapping will still work with your new figure (if you have already made the uvmapping). If you have any problems with this, just ask, but it is really quite an easy thing to do.