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Reach a xenfor instance from more than one domain

I have a community running on XenForo and there is a request to add a sub-forum which should be run in a different domain.
I have created a domain alias for the second community pointing at the same zones in DNS /apache as the primary domain.
My point is how to introduce a ReWrite or Redirect Rule that forwards all request in a second domain to a inner forum.

What I need is to Redirect all request to www.domain2.com to www.domain2.com/categories/forum_id/
For some reason I am not being able to do this through .htaccess. Any one had a similar problem?