This feature is on the backlog. I will update you when we have more details to share.
I’m super excited about this one! This should help the daily user experience tremendously. Looking forward to bringing this to you.
if you have an existing post that you want to show in a different channel, you can edit the message and cross-post. This will add the top-level post to the different channel, but will not include the full set of replies. We will keep this request in mind as we evolve the cross-posting feature in the future and update if the status changes.
Details on cross posting can be found here: https://support.office.com/article/cross-post-a-channel-conversation-in-teams-9c1252a3-67ef-498e-a7c1-dd7147b3d295.
This item is still under review. No new updates at this time.