create a second quantity input and button to add a quantity specified in an attribute to the cart. For example, A product with attribute "Box: 6 units" the value 6 must be multiplied with in the quantity input, if it puts in the quantity input 1 6 units of the product would be added, if it put 2 12 units of the product to cart.
If you think you can make the arrangement write me and leave me a price.
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Hi there, I have understand what you want and I am pretty much sure that i can do it. I have 10 years experience. you can check my profile. DM me for discussion. Regards, Rahul