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Correct - there is no copy permissions function.

XF permissions are cumulative and inherit from parent nodes, so it isn't necessary to specifically set permissions for every user group and node combination.

This post explains the parent, sibling, and child relationship: https://xenforo.com/community/threads/why-use-a-sibling-forum-instead-of-a-child-forum.193950/#post-1514642

Passwords are retained when importing from phpBB.