Purchase a set, sell items.

Hi all,

First at all, sorry for my English, I'll try to explain my 'problem' as clear as possible.

I purchase to my supplier a set that contains two different items (A & B) but I sell them separately as "Item A" and "Item B" that are physically different with different names.

I think that I can create both items and order both of them every time I purchase the set to the supplier, dividing the price (cost) between them. This way will work fine with the stock.

The question is, is it possible to order/purchase a set that automatically increase the stock for two different items?

Thank you very much for your help and thank you very much for a very good script.
Gassganso.