Karen:

I was able to create and link two reports ... one from the header info (I used AP trans with Vendor from the combined tables) and one from the G/L disbursements file. The trick is to use the "trx ID" field in the in the former and the "Trans ID" field in the latter.

Create a calculated field in the header report called "Trans ID" and make the formula just reference the "trx ID" field. Then they will link.

You will have to click on each Vendor (contractor) to get the GL details from the invoice, but it is accesible this way.