[Belevation]

I browse and read several pages of post on "Extra Field"; I was interested in using dropdown menu, but it seems like I may not be able to. Here's what i need:

1. 3 products that is available 4 sizes and 3 colors
   
   example:
   in Support Brief availabe in black, nude, white and sizes S, M, L, XL

does each of the color and size consider as 1 extra field? if all of my products have the same sizes and color names, how do i declare so that it's a global variable so all of my products can use it? without dropdown option, what I can use instead?

thanks