Can I have more than 1 Multi Variant for a product

[websmith]

I have been trying to add 2 multi variants to a product with no success. I want to have 2 different drop down menus, 1 for colors and 1 for sizes.
I have created custom field for each of colors and sizes. I am able to add one or the other but cannot add both. They seem to either conflict or show a select option link that doesnt work.

Can someone please help.