You can assign role permissions to individual modules as well as pages. If you have a page that you want everyone to see but there is content on that page that you only want paying users to see, I would set it up this way:

1. Set the permissions of the page to Unregistered Users. This will allow anyone to view the page.
2. Add all your modules. These will inherit the permissions of the page so they will all be viewable by everyone.
3. For the modules that you want to be viewed by paying customers only, set the permissions to Registered User. This means that the user will need to be registered with your site to view these modules.

I'm not sure what you mean by "need to know that can we 2 modules within any text html module". Adding modules inside modules???