For example, lets say I have two sentences in a thread:
1: I don't like purple people.
2: I don't like orange people.
I want sentence 2 hidden from usergroup "orange people" and sentence 1 hidden from usergroup "purple people"
Incase your wondering I am using it to setup pages for paying customers, non paying customers get a preview of the content while paying customers get all the content, and it's on the same thread to keep things simple.