Within Teamwork Chat, you can create a new channel at any time in the Android mobile app.

In the Channels tab of your Chat app, select the blue icon near the bottom right of the screen to open the Create Channel modal.

In the Create Channel modal, you can add a title and description for the channel, as well as add users. 

At the bottom of the modal, you can set the channel visibility to private or public. When a channel is private, only people added to it will be able to see it and search for it.

For more information, see: Downloading the Teamwork Chat Mobile App