XF 1.5 Change forums permissions in batch


I am new with Xenforo. I just migrated a SMF forum to a new Xenforo installation. All went ok but there is a detail and I wanted to know if this can be achieved.
All forums were imported ok, but only 2 of them has the right permissions. The other forums aren't accesible for registered users for example. Is there some way to modify several forums's permissions in batch or copy the permissions from a forum to another? Or the only way is change one by one?

Thank you in advance,