Channels are spaces that allow you to communicate with a specific group and in common, since within Orders you can communicate with each member or you can chat with all members at the same time, but not with some groups.
To create groups or spaces, just follow the same procedure as when you are inside an order. Click on , add a title and description. Select the space and click on to add members. You can then create small groups, either with your suppliers or with your teammates.