Is it possible to create for each forum given a group afterwards?

I created a forum with Drupal 7. Now the forum structure is already given and the first posts dropped in. I would like to add another function to the forum so that users can add also groups to the system. The problem is that I do not want to open different forum and group for the given names. For example, a forum for WordPress should not be opened again in a separate group. Instead of this, I would like to add a group for each existing forum. Is this possible? Has anybody experience in doing this?

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