New Contributor

I'm not sure how to ask this but here is my dilemma...

The company that I work for uses Quickbooks for the accounting side.  We were told that in order to pay an invoice we would need to create a purchase order, which would create a bill, and then export it over to Quickbooks so that we can pay it.   I always attach a file (copy of the invoice) to the purchase order and the bill but when I go to the Vendor in Quickbooks the file is not attached.  

What is the easiest way to get this file attached without having to attach it to the purchase order, the bill, and then have to go into Quickbooks and attach it there?

I hope this makes sense!!