Yes. Open the joint editor (Window>Joint Editor) and look for the red and green cross hairs that will display on the object. In the joint editor menu look for where it says Center Point, with X Y and Z under boxes. In Poser 11 if you click on one of those boxes you'll get a dial that pops up and you can move the green cross hairs to your desired pivot point. The red cross hairs are the end point.