You can do that by treating the beam as solid (Right click on structural member in the Simulation study tree and select "Treat as solid"). If you want to use beam elements, then define the BC's at joints.
You can do this. You need to select the right option in the force dialog box (beam member icon or joint icon). You need to hit selected direction first though to get them to appear. They should change the interface to show them grayed out till the selected direction option is selected as opposed to hidden in my humble opinion.
Dear Ashish and Bill,
Thanks for your help.