Has anyone successfully either edited a standard invoice template so that it's suitable for international shipping and includes weight, shipping reference numbers and commodity codes, or successfully created their own and imported?

I've tried both methods after using the guidance provided after scouring the community board for help and watching various videos. I'm not having any success, particularly with mapping the EZ codes. Some of the fields I have on QB aren't referenced in the EZ Map Fields document, and there aren't enough custom fields to cope!

How do I incorporate a commodity code into my product/service information? Where would I detail an item's weight? HELP!