Teams and Roles are added from "Circles View" or "Table View" in the "Structure" Tab located in the Team Workspaces module found on the left-hand side menu:

 

Teams and Roles can be added via a modal by clicking on "+ Add Team" or "+ Add Role" on the top-right part of the screen:

 

Teams can also be added in the Table view structure spreadsheet by selecting "+ Add Team" at the bottom of the table:

 

Teams and Roles can be removed/deleted from Sobol by clicking on the three dots next to the name of the Team or Role (in Table View) and then selecting "Delete"