Thank you so much for your reply! So, I have to use Users Groups or Access Level?
I want to create something like that:
http://oi59.tinypic.com/2lwkqyw.jpg
I want to change the categories access for users by front-end.
It's possible? If yes, your team make do this for me?
I want to get VIP user. (Sorry, my english it's so poor)