Grouping Word Documents

I was wondering if there was any way to group a set of word documents, and
then define properties for the set as a whole. For example, it would be nice
to be able to specify a project name and number in one place, and then refer
to it in each of the project documents using fields. That way, if the name or
number changed, it would automatically update each document.

Any thoughts? It seems like Word should have this capability, but I can't
find a way to do it.
.