Tina,

Stay in the same thread with your follow up postings please.

So you want Project 1 pages numbered A-1 through A-whatever
                     Project 2 pages numbered B-1 thorugh B-whatever

Correct?  Yes.

To get Word to automatically insert the "A, B, C, etc."  you need to apply a
numbering to your Heading Sytles.  A primer for doing this can be found at:
http://www.shaunakelly.com/word/numbering/OutlineNumbering.html

With this done, your Project 1 chapter heading will look like

A.  Project 1.

When you format the page number select the option to "Include Chapter
Numbers."

You will need a section break next page at the end of each chapter so you
can use the Format Page number "Restart at" and select 1 in you new
chapters.