There is no plugin for this currently.
A plugin would have to analyze a BP installation’s xprofile field data to do this.
BP 1.3 will provide greater facilities to build such a plugin with the addition of profile meta.
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Oh, and in the future, please don’t bump your own topic less than 24 hours when you started the topic.
Sorry my first post
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Is that with the existing group functionality to solve?
How can I add another group tab (eg “other group”)?
This new tab “other group ” should go through the same steps like to create a new group. In step two (settings), it should be directly a private group, without the forum (no choice). In step 4 (invitations), only be invited friends there are, not even in the “other group “.
Any ideas and tips how can I implement it?
What should I do, what files I need to adjust what tables do I need?
That would be serious work. You’d have create a component of your own. No way to do that on top of the default group component.