🚀 go-pugleaf

Yes, it can be done, provided you do not need to typeset your document
book-style with facing pages.

WordPerfect has a dual set of both headers and footers, which are referred
to as Header A and Header B (and Footer A and Footer B).  To do what you
suggested, just define Header A as your document header, and define Header
B as the subdivision header.  WordPerfect will change Header B each time
you define a new header code.

Then, when you edit, if you want to change the document header portion
just edit Header A, and that header will change throughout the document.
If you just want to change a subdivision header, edit the correct Header B
code.

Problem with this is that, if you want mirroring headers on facing pages, 
you can't do it because WordPerfect supports only two headers at a time.

I'd like to suggest that, if you're actually doing a large book, you look
into Word for Windows or Microsoft Word, though.  I've just finished 
putting a 300+ page manual in WordPerfect with a ton of graphics, master-
document structure, and a bunch of fancy formatting.  The program worked
fine as planned, but because WordPerfect 5.1 has a bug in handling EMS and
XMS memory, it hung or crashed the 386-25 and 286-20 at work constantly
when anyone attempted to edit or print the entire document at once instead
of by sections.  And, unfortunately, for some of WordPerfect's best
features to work, you have to edit the thing at once.

Cathy