Isn't setting up categery a simple default setting that you activate in the BBoard admin function. At least that's how use it on our 3.25 bboard. or am I missing something?
Here's the explanation
Categorization
After a Q&A forum has collected a few thousand messages, it becomes tough for users to find archived threads, even when the software is running on a server with a full-text search engine. Categorization lets you support browsing as well as searching. As the administrator, you are always able to recategorize messages and define new categories. If you want less work and don't mind a little chaos, then you can allow users to categorize their own questions (they get a select menu when they post a new question). If you don't mind a lot of chaos, you can allow users to define new categories.
Present Categorized? Yes No
Ask User to Categorize? Yes No
Allow Users to Add New Categories? Yes No