I like this menu system.. the green area on far left is a good indicator of where to start, i want the middle section to be similar – to be a sub menu.. for exampl..

WHOLE SALE CAT PRODUCTS > CAT FEEDING > bowls, snack dispenser, treats etc…

You see how i want that middle section to be a main category identifier, this make sense?
How can i make it so that middl section is a sub menu of products… ?
Thanks.