in virtuemart: On product page, imagine a product name, product picture and a list of few packing materials and services (eg. box, sticker, delivery from A to B, etc). Action needed is this: when (1) shopper enters quantity for product, it should (2) change the quantity of listed materials used for that product (eg. if 2 units entered, it changes q-ty of boxes to 2), (3) show that newly calculated quantity for those materials, (3) show cost for that newly calculated quantity of those materials, separately, for each of them, (3) let shopper change that newly calculated quantity for each of them, and let shopper to separately add to order each of those materials, and the product, and be able to see them all listed separately on his order. Meaning, shopper sees the quantity of the main product with its cost, the quantity of each material that comes with it, as it was changed or remained as the system calculated, and the cost for those materials separately.