288725 Shopping Cart attributes

We have an OScommerce site, when a customer adds to the shopping cart, there is no way to change any attributes in the cart. We want the customer to be able to change attributes and amount of product. I.E. Currently if a customer chooses the color white and long, when the item is added to the cart, the customer has to delete and re-enter information to change color etc. We need the customer to be able to change the sub attributes from the cart