How to move conversations
- Find the post you want to move.
- Click the overflow menu on the first message.
- Click Move Conversation.
- Select destination group and add a reply to the conversation if you would like.
- Click Move and the conversation will be moved to the new group.
Availability
This feature is available in the Yammer web experience and Yammer Desktop experience after January 12, 2018.
Source / Read More : https://support.office.com/en-us/article/move-conversations-in-yammer-149c6399-4ac1-4ced-84d7-e0660960a872