It helps for all the reasons given in the post I linked to in my post above.
Now to your real question, weeverboy:
If you by user category mean a usergroup, then you click on usergroups on top of the forum, find the right usergroup, if you have more than one, and add the members there.
You will find a field where you type the username, and click Add member, and there is also an option to look up members.
If you haven't created a usergroup for them yet, and/or if you want to have private forum(s) for this usergroup, then I suggest that you read this Guide. It takes you through all the steps:
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FoxLeonard