Phone Case with same design but different colors

[patriotic2023]

In Printify, I need to create a new product for the same design in different colors. Unfortunately, that's how they need to track inventory on their side. 

So, now I have 5 different phone cases (products listed on shop page) with the same exact design but different colors.

https://patrioticamericanclothing.com/search?filter.p.product_type=Phone+Case&options%5Bprefix%5D=la...

I want to be able to show a master product on the page broken down with different colors. But, when the individual color is clicked, it opens up each individual product like this: https://s-gents.com/products/sg-lightweight-overshirt-sand . 

So how do I combine products together but still have them retain their individuality because the right product ID/SKU needs to be passed to Printify? I don't want to download files and upload them for each phone case. that will take me days. 

We are working on our descriptions but this is the only thing stopping us from going live :(. Please help. 

[patriotic2023]

Can Anybody help? 
I have heard about the app excelify that let's you download file, make changes (edit/delete) and then upload again. Way too many products for me to be able to do that!

TIA!