Update Multiple Stock Amount Options

I have an inventory of prints, each print can be sold framed or unframed, as an example, if I have 100 prints, inventory will show an Amount In Stock of 100 for the framed option and Amount In Stock of 100 for the unframed option, even though physically I only have 100 prints.

I only want one part number not two, when a print is sold, the print part number and the frame part number.

If I create an invoice line, the Commit From Inventory script needs to decrement the Amount In Stock
by one for both items, the framed and the unframed options, of a given size, even though only one of the items has been sold.

The print part number would be PRO0029 and the two option numbers for this  print would look like this
for a framed and unframed part, GF22x40 (framed) and GU22x40 (unframed). A print could have other size options GF15x30 and GU15x30 etc. they would not change. Any suggestions on how to approach this.