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The most common way that users can be bulk-added to a user permission group is to use an AD group synch. So if you've got AD groups you can use, it is possible to do this out-of-the-box with a little configuration (Support can help provide some insight into how to do this).
If you can't use AD groups, then another option is the user synch add-on which is here: Basic User Sync Connector (the other document was outdated and archived).
APIs could be used as well - there should be more info on this in Jive Developers
Thanks a lot Michelle, I'll look into those solutions!