Super Easy Word Merge onto multiple tables?

I posted my problem a few days ago and Wayne had a suggestion but it has not
resolved it - here goes again:
I have a Main form and several tabbed pages and a couple of subforms. Each
of these is based on a different table.
When I use the Merge on the Main form all is well, because it only has to
look at that table and I can get the necessary mergefields working fine.
But when I add the Merge button to any other page (form) and try to create
templates based on the fields in those pages, it will still only see the
table underlying Main, it will not allow me to see the tables and fields
relevant to those other pages.
I tried Wayne's suggestion and created a query incorporating all the fields
that I would want to use in the various document templates and then created a
form based on that Query.
That worked fine on its own. But when I added that as a subform into one of
the other pages, having created the necessary child link so that the specific
record could be read, I'm back to the same old problem again.
This is a real pain - I WANT to use this great feature on my various forms,
picking up the data from several tables at once and merging into a variety of
docs.
Is Albert around, please - if anyone, I'm sure he will know!
Thanks a lot
CW