Renumber document at annex portion of document

[jeffreybrown]

Can't seem to figure this one out. In this document at page six starts a few pages of Annex's.

I would like to renumber the Annex's with the letter designation in the footer. I've already applied a SEQ field to the Annex title, but now how to get the page number to follow?

Such as, page six, Annex A, can the page number show as A-1 followed by A-2 if there are more than one page to the Annex.

Then when Annex B starts, B-1, Annex C, C-1, etc.