ellieilluminate

Hi, I recently started working 3D, and therefore have joined up on the boards to get a little help. I've got my 3D theater all mapped out. I've got all the overheads units in place, but can't seem to find a way to put sidearmed units onto booms for this 3D view. Looked in the help and searched here, but am missing it. Thanks in advance for any help. ellie