Subcategories

Hello,

I am wanting to make it so folks can create there own Subcategories in easy blog. Lets say I have a main Categories of:

Arts and Entertainment (Main)

(They would be able to create the following under the main)
--Music
--Pottery
--Oil Painting
--Water Colors

I am thinking it would be like in Easy social how they create groups under a certain categories.

Kind Regards,
R. Baker