Currently there is no way to forward a message to a specific chat thread, or for that matter, move a message that was put into a group chat into a thread contained in that group chat. This would be a helpful feature for a group admin, so that the admin could keep chats properly organized even if individual users accidentally send a message in the wrong (or no) thread. Currently, I think the only work-around is for the original sender to delete the message and then resend it as a reply in the appropriate thread.
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