Using Drupal Commerce here, is there a way to adjust the variation price base on the first or second variation selected? For example I have 3 variations. Size, material, color. So if i choose small (that cost $5) and then material that is $10 ($15 total), then when I choose Large at $12, the material should cost $20.

I guess maybe something with Rules, but its not apparent? Or is it built in? Anyone done this?