I just opened up a store front and uploaded some designs to several products - shirts and hoodies. A couple of these designs have transparency that are meant to be printed on black only. A couple are just meant to be printed on a dark color garments. The problem is I can't find a way to prevent customers from choosing from all of the color options for the product. How would I specify which color I want to limit the choices to, or at least which ones the customer shouldn't be able to choose?