We have upgrades that we would like to apply to products in our designer. For example: Upgrade from vinyl to glitter, upgrade from spangle to rhinestones, add a name and add a number. When we have several logos for a particular store, it would be much easier to set the store up with a designer vs. creating 100 products. But when we do it this way, customers don't have the option to do add-ons or upgrades. Even if we list the upgrades as a separate listing, if the customer orders several shirts, we don't know what shirt they want the upgrades to apply to.