one item, different sizes (and prices), order all at once?

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I understand how the cart is set up now, but this is how I want it to look:

In catalog:
Sticker
SM ___ * $2.95
MD ___ * $3.50
LG ___ * $ 3.96

They can type in the qty they want per size at the same time for one item instead of having to add each size separately to their shopping cart, as it is done now using the drop down list.  I want them to be able to do this all at once by typing in the qty.

Shopping cart:
Sticker 
10 SM @ $2.95
15 MD @$3.50
5 LG @ $3.96

This way they can see the one item on one line listing all the sizes and prices instead of being separate lines in the cart as it is now.