BuddyPress.org

Yep, I did some playing around, and figured that out, but definitely good to have my instincts confirmed. I’d been under the assumption that a multisite install actually replicated entire WP installs in different locations, so I was a little stumped – shows how new I am to multisite…thanks very much @mercime, appreciate the help!

For anyone else trying to achieve the same result, I found this article really useful: https://codex.buddypress.org/getting-started/install-buddypress-on-a-secondary-blog/