Frequently Asked Question:
In what eBay categories are multi-variation listings available?
Currently, multi-variation listings can be created in the following categories: Baby; Clothing, Shoes & Accessories; Crafts; Health & Beauty; Home & Garden (most sub-categories); Jewelry & Watches; Pet Supplies and Sporting Goods.
Note that not all sub-categories are supported. You can use eBay's category lookup tool http://pages.ebay.com/sellerinformation/growing/variationtable.html to find out if listings with variations are available in your category.