Within the Enterprise plan you can click on the group name in the top left corner of the app to select and manage the groups which can be used to manage publications for different brands or markets.
Setting up different groups can be useful to manage different product feeds and Reader settings when publishing publications in different markets that each use a different language, currency, prices etc. It also helps manage different brands in a single account, where users can be assigned access to the publications of their associated brand.
Admin users of the Enterprise account are able to create new groups using the button that appears at the bottom of the dropdown menu.
Creating a new group: