Marketpress product options dropdown

I would like to include products with multiple options without having to make the user visit an extra entry for each option - e.g. a t-shirt that comes in red, white, green, and purple. I'd like to have an entry for the t-shirt with a dropdown menu giving color options. Is that possible to do with MarketPress? I don't see an option like that on the tutorial videos, but I may have missed something - I'd much rather READ my tutorials than watch them.

Thanks!