Have a word with Garry at X-Cart Plus
http://www.x-cart-plus.com
He has recently done a mod for my website which is much more complex than the one your talking about so it shouldn't be difficult for him to do yours. You can see the mod he did here
http://www.bellaforma.com.au/shop/Daisy-Underwire-Bra-p-1-pr-16195.html
The stock grid is Garry's work and the key shows the various types of stock I can have. It works like a dream and I can highly recommend Garry he's a great bloke
