Copying a substack

[Devin Asay]

Hi folks,

Sorry if this has come up before.  How do you make a copy of a 
substack within a stackfile?  Both the clone and copy commands will 
make a copy of a stack, but they are created as mainstacks.  I want 
to be able to copy a substack and have it remain subordinated the the 
current mainstack.

Alternatively, is there a way to change a mainstack into a substack?

Thanks,

Devin
-- 
Devin Asay
Humanities Research Center
Brigham Young University