Sometime, you need to post message to multiple Teams channels. Until now you had to re write all the time (or a copy/paste) your post across all the channels you wanted to post to.
Well, good news, Teams now allows you to post in multiple channel at once.
To do that, open your Teams client and reach out one of the channel you want to post
Just just below the message box, click on the Format button and select Post in multiple channels
The list of targeted channels will be displayed just below the formatting toolbar, with off course the current selected channel already added
On the right side, click on Select channels and select the additional channel(s) you want to post to