Ecommerce store

I’m making an ecommerce store to sell longboards, skateboards, phone cases, and posters and i was wondering how to make a choice where the customer can pick whether they want a skateboard or long board on one design then on the phone cases they can pick what type of phone they have. I need help separating the choices and how I should set up the spreadsheet to that the information can be recorded correctly. Once I get this feature in the app I can fix my featured in the homepage.
Here is my app:

Maybe you should start from a template from the store and see how all the information is organised in the spreadsheet…

So on a skateboard details view, you want the user to have choices related to the skateboard but on the phone cases details view, you want the user to have another set of choices that is related to the phone cases. Is that correct?