Is there way to have it set up like this?

have 3 drop downs

I.E.

i have three master categories

CAT 1, CAT 2, CAT 3

each of those master categories has sub categories.

CAT 1
- SUB 1
- SUB 2

CAT 2
-SUB 1
-SUB 2

CAT 3
-SUB 1
-SUB 2

each of those sub categories has the products in there.