Need a solution for Shopify product page

Hi, I need a designer who can come on board and sort out an issue with an Shopify product page

Currently I have size variant options but also have the option to add in a frame option

I want the drop down to contain only the sizing

and the frame to add the additional cost

the trick is the frame cost will be different for each size

I can provide an example of a shopify website that already does this

I need someone to come on board and fix this issue