php - Create a shopping cart rule in Magento based on product attributes -

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i have products (needles) in category. of them sold in packs of 100 , in packs of 500. quantity of needles in box set product attribute. want apply cart rules based on total number of needles in cart. f.x. 10% if buy 1000-2000 needles, regardless of combination of 500/100-packs. don´t think can done vanilla magento (ce 1.4.2.0) , haven´t found module it. have tried magento forum, no luck there. point me in right direction?

you have single "needles" product , set it's "qty increments" 100. if wanted, say, 700 needles order 700 , staff responsible picking out box of 500 , 2 of 100. make discount possible wouldn't allow different skus stock control difficult.


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