OSC module: URGENT

This is for a OSC expert. I am looking for a way to add a quantity box to the product attributes. For someone who is an expert with OSC, this will be easy to understand: A product has 3 price ranges. Now, we need to give an option for that product, say a spare part, the product attribute allows me to add the option, but the default quantity is 1. If a person is buying 4 products, he will need 4 spares, how will he get those?? Hence I am looking at getting a quantity box for the products attributes too. Please reply with an example if you have done this, or a mockup if you have understood what i mean. best regards