headings

How to link Subtotal headings between modules?

Can some kind soul explain to me how I can link subtotal headings between modules?  I've been trying, without success, for months now.

In one module, I have a category group which contains all labels for districts of a country (which are entered  as assumptions.). There are 72 districts.  These districts are grouped under subheadings of their  three regions.  I replace the autogenerated names (e.g. subtotal 3 name, subtotal 2 name.) with the names of the regions.

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