We provide no tool to help with migrating data. It's all a manual process. Ensure both have Joomla, CB, and your CB plugins up to date. Then I suggest just manually moving database tables using phpmyadmin. For CB the relevant database tables would be all tables beginning with _comprofiler, _cbsubs, and _groupjive. For Joomla user data you'd need _users and _user_usergroup_map at the very least, but ideally all _user tables, _viewaccesslevels, and _usergroups.
Kyle (Krileon)
Community Builder Team Member
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