[@chrishajer Participant 15 years, 8 months ago]

0.9 supports subforums, but in 1.0 categories are built in. To me, a category is a parent forum that does not allow posts. It’s not built in to anything but the 1.0 alphas right now.

This plugin states that it works up to 0.9.0.2:

https://bbpress.org/plugins/topic/forum-is-category/