how do you have categories AND subcategories in the side box?

[jamesdavid]

For this site;
http://82.110.105.53.cockerssports.co.uk/shop/

The top left sidebox called ‘Sports A to Z’ has categories AND subcategories which open when you click on the parent category. How do you do this?

I have categories and subcategories but clicking on the category
just goes to the subcategories page and does not open in the menu.

[TShooters]

In Admin/Configuration/Layout Settings, set
Categories - Always Open to Show SubCategories to 1.

[jamesdavid]

Thanks a lot. Im hoping this will help me with this;

How can I add another level to the menu, so if you clicked on ‘products’ the menu below would have links to the product's page’s?
This is the menu I have at the moment;
http://www.jameschetwood.com/menu/menu.jpg
And this is what I’m trying to achieve;
http://www.jameschetwood.com/menu/menuiwant.jpg

Post located at;
http://www.zen-cart.com/forum/showthread.php?t=99085

Do you know if this will work? I'm hoping I could do this with just CSS.