Another STANDALONE query, I'm afraid

[John Ridge]

I now understand how to build a Standalone that saves data in a stack -
first make a "stub" stack, and then create your real stack as a substack,
and set the standalone options to treat it as a .rev file, so that the
standalone user can save to it.

My problem is that before I appreciated this, I had created a large stack as
a mainstack. Now I want to make it a substack of a new "stub" stack.

How do I do this? I hope it's a really simple question that I just can't see
the answer to...
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