I've read the Contribution rules and especially the section on box sets.  I have a Double Feature, 2 discs in a standard keep case with a gatefold digipak..  The Double Feature UPC is not in the database.  The individual discs are both in the database but they are listed as individual discs with their own UPC numbers and independent cover scans.  The disc IDs of the discs in my Double Feature match the disc IDs already in the database.  I need to make 3 new entries, one for my Double Feature "box set", and one for each of the 2 discs in my Double Feature.  The cover images on all three of my entries will be the same (that is, the double feature covers).  I want to use the existing UPCs of the individual discs as the template for those entries but I don't know how to get rid of the UPC number.  I know how to edit the UPC number but the system won't let me remove it entirely.  How can I do that?

Here's how: put the disc in your DVD-ROM drive. Open DVDP, go to DVD / Change UPC. Tick the "Use disc ID from inserted disc" box. Click OK, and you're done.

You can find instructions on cloning profiles here

Hope this helps.