Posting Variations on Amazon seller central

Hello guys,

I am working on selling eyelashes on amazon and I am having trouble posting the variations the right way. I need to be able to post the eye lashes by size (8mm-20mm) and by Curl (C, D, Cc). For each curl, there is a mm variation for it. So, as you can see it is a bit tricky. Does anyone know how to do this? Anything helps!