Same question. How do you merge multiple subtools. I tried a few things and nothing worked. Even turning it into a polymesh, or exporting. In Edit mode, not in edit mode. If it’s possible, could somebody say the steps?
As for transforming a subtool (such as rotating it), you should be in Edit mode, with the subtool active, and Rotate enabled. Lay down your Action Line, and move the handle. You are just not used to the action line yet. hey, me neither. 
:idea: BTW, here’s a neat Sub-Tools technique. On your Mesh, use the Mesh insert brush a few times. When you are done, goto the subtools palette, and press “GrpSplit”. This will turn all your dropped meshes, into subtools.