You can use this option for defining such exception and make Pine automatically sort your favorite Newsgroup by Ordered Subject. On the other hand you may be suscribed to a mailing list, and maybe you don't care to see in the index the size of the messages, however in other lists you may want to see the size of the messages. You can use this configuration for changing the way the index is displayed in a folder. Also there may be a mailing list that identifies itself by adding a certain string to its subject which makes difficult to read the total subject, so you may want to delete that string from the subject whenever it appears. You can do that also with this configuration.
Every rule has three parts, a condition, a separator and an action.
The action is what will happen if the condition of the rule is satisified. But for the most part this will be the only one you'll ever need. Now let us see how to do it. There are 8 functions already defined for you. At the end of the document you will find more examples.