Multiple DDS, One Definition

I have four physical files that need to have the same structure.  I'd like
to have four separate DDSes, one for each of the files, so that someone
needing to find the definition of a file can just look for the DDS with
the same name.  Since the files have them same structure, I'd like there
to be a single "master" definition that the others will all reference.
Does anyone know how I could do this?

From looking at the docs, I don't think REF will help, since that requires
each field to be entered and made a reference.  Thus, if a field were
added to the file, all of the child DDSes would have to be updated too.

Ideally, I'd like to be able to say "This member of this file has the same
fields (and definitions) as this other member in this other file."

Can anyone help a poor lost soul?
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