You can now use Quick Shopping Cart to set up a single product that supports multiple option variations, and track inventory for each variation. For example, instead of maintaining separate products (say, one T-Shirt - Red and one T-Shirt - Blue), you can now create a single T-Shirt product, configuring it to have separate inventory and availability for its variations. This update supports colors, sizes and any other option you create. That saves you time so you can get back to what you do best... selling your product(s).