Qty discount totals Customise

Hi All,

at the moment CS doesnt allow product options be added together in the cart to give the qty discount.

i.e I have t shirts that come in sm med and lge, and qty discounts set for 25+ but according to the set up as it is now CS will only give the discount if small is 25, med is 25 and lge is 25,

I want the discount to given if small= 10 med= 10 and lge =5 added togerther = 25?

will pay for this to be modded

make sense hope so?