I just started working with 4r7, trying out the various ZModeler actions.
My test workflow was dragging out a tool, clicking Make Polymesh, then going to Tool->Initialize and setting up say a qcube for zmodeler. Did some work on that mesh and decided it was time for another part of my model. I went to Subtool->Insert and then tried following the same flow by clicking on Make Polymesh & Initialize.
Unfortunately Make Polymesh caused my first Subtool to disappear and my Undo stack to be deleted without any warning. Yikes!
Two questions:
a) what would have been the correct way to add another qcylinder as a subtool ?
b) how do I get my previous subtool (and Undo stack) back after accidentally clicking Make Polymesh ?