As an organization administrator, you may need to create different departments for structuring your events. To create a new department, click the profile icon near the top right of the page and select Account from the dropdown.
NOTE: Only Administrators can create new departments.
Then click the 3 dots on the right hand side of your organization name and select "Create Department".
Enter the name of the new department and click "Create Department".
Now you can add users to the new department.