As a Project Administrator, you can create groups directly from the browser application interface or by importing an Excel spreadsheet. Using the import function is a great way to create groups in a bulk operation.
See Import Users & Groups for details.
Go to the Team page.
Click the New Group button at the top of the page.
The Create Group dialog box opens.
Enter the Group name.
Note: The Group name must be unique. An error message will be shown if you try to create a new group using the same name as an existing group.