Use main category just as parent for sub in Downloads?

[BoXon]

Hi!

Is it possible to have my "Main" category just for creating sub-categories in?

For example if i have a file library for game content i want something like
Grand theft auto IV
--- Cars
--- Busses
--- Trucks

Grand theft auto V
--- Cars
--- Busses
--- Trucks

But i don't want to use the main category to be able to upload files to, only the sub-categories?

Is it possible to arrange such a setup? :-)

[BoXon]

Okey i fixed so that you cannot upload files to the main category anymore... But i'm still displayed with "There are no files in this category yet." 

How can i remove it from just the main category?