Suppose that I'm selling vitamins. The same vitamin has three bottles, containing the same vitamin in it but with different amounts. When a customer chooses, say vitamin A, he will see the first bottle having 30 but he will be able to choose, if he wants, the other bottles having 50, 100, etc. with a radio button on the same page. So, the price will change if he chooses the other product. Does ZenCart support this?