Want to display different categories for different posts

Hi,

I am using wordpress 3.0 and i am facing problem that, I have two different section one is paid and another is free. And these two sections have different categories and posts. So I dont want to show the categories and posts in the paid posts as well as in the free posts and categories. I was searching a solution for this i didnt get. So please help me to solve this.

Thanks in advance.

Sanoj