Document Managment in User Account

Hi Guys,

I really like the document / file upload feature, i.e. also with the possibility to create categories - once you have created a group or event, that is within a group or event.

How can I add the same document management feature into my account list as a standard feature without having to create an event or group?

Please see screen shot.

Also is it possible to create sub-categories under the main categories to make it more structured?

Thanks!