Page numbers 1-1, 1-1A, 1-1B, 1-2

[Chappster]

I have a document that currently has four sections and the page numbers are 1-1, 1-2, 1-3 and so on. If I need to insert a page or two between 1-1 and 1-2, I would like to change the page numbers to reflect 1-1, 1-1A, 1-1B, 1-2…. Is this possible in Word? The document is hundreds of pages long and if we can set it up like this we only have to insert two pages instead of printing out the whole section.