How do I make an Invoice layout using two portals?

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I have a file called "sales" showing sales for different companies for two products - A and B. The two products have to be in separate detail files as they have different pricings and definitions. I want to produce an invoice in "sales" showing all sales for both products. I can make invoices separately in files A and B but I can't produce a combined invoice in "sales".

I currently have a layout in "sales" with portals for A and B, but when I come to show the results on an invoice the layout doesn't work. I have tried the sliding/printing but some of the portal results for product B are over 200 and my layout cant cope!

Is there a way I can have two body and two header parts on one report to show results from each file?