How to create a menu showing sub-categories under more than one category

Hello

I would like to add some sub-categories to several categories but am having trouble doing it.

I would like a menu structure as follows:

HOME SHOP MEN WOMEN CHILDREN

Under MEN there is
Formal Shirts
Polo Shirts
T-shirts
Long Sleeve Tops

Under WOMEN there is
Blouses
T-Shirts
Long Sleeve Tops

How do I create the above so that when MEN –> T-Shirts is clicked, only men’s t-shirts are shown and when WOMEN –> T-shirts is clicked, only women t-shirts are shown.

I can’t find anything in the demo versions or documentation that covers this.

Thanks very much