I need to create a various categories and subcategories.

I'd like to make the subcategories 3 layers deep.

 

Example:

 

Webconferencing (Main Cat.), Information (What the user is requesting), Administration (What need is about), and Set Permissions (What the agent is responding with).

 

Is this possible?

 

I only see 1 layer deep...

 

Assistance is appreciated.