In the past I was able to do this. Basically I would go to Vendor Inquiry->Attachments (paperclip). In the attachment manager I would click "Create Object." Then I would click "Insert Object" and select a PDF file stored on my computer. The PDF file I would link included all of the invoices for that particular vendor. Over time, as I accumulated more invoices I would just scan new invoices and attach them to the PDF with all the invoices. There was an option to have the PDF update automatically everytime I added to the PDF file, but I don't remember how to access it.

The basic idea is that each time I add an invoice to the master file, then it would automatically update the attachment in BW. How can I do this?