Report- Breakdown of GL Expense Account By Vendor

Does anyone have a Crystal Report already written that has the
breakdown of a specific GL account by Vendor? For example, I want to
know what my office supply expense account consists of. I use the AP
invoice tables and it works great, except it doesn't include the
invoices that come through PO's (periodic postings). I'm assuming I
now have to link tables to get this info. Just wondering if someone
already had this written. Please e-mail me if you can help.