Create new mainstack (not substack)

[Kurt Kaufman]

While running a stack (will be a standalone) I would like to create a new 
mainstack in a specific path. I understand that I can set this path by using 
the defaultFolder property. However, I don't seem to be able to save a new 
and separate stack, only a substack.  And I guess I can't set a substack's 
mainstack property to itself......(Rev Win 2.0.3)

Thanks, Kurt