I am building a sunglasses website and need to have a prescription option for some of my brands. I would like to add the prescription variant with the rest of the styles. Then, when a customer picks the prescription variant I need other variants to appear so they can choose the features desired for the prescription lenses (and their related prices added to the total of the order). Can anyone give some input or suggest an app that may be able to handle this. So far I only see a few people talking about coding and java and I am hoping there is an easier way as that is not my strong suit yet.