[johnhiler]

This is absolutely possible. I wrote a bit about it here:

https://bbpress.org/forums/topic/create-multiple-forums

I now have about 10 bbPress installs all working, and they’re both integrated with two separate WordPress installs. So this is definitely possible. You just need to make sure that all the installs are using the same users table.

The bigger issue is: do any of your installs share usernames? For example, a “John” registered on one site and on another one? That will be tricky to manage – a path is described nicely here… look for the section on “user_id” conflicts:

https://bbpress.org/forums/topic/integration-of-established-wp-and-bbpress-installations#post-28701

Good luck!