Subbasin Manager 
To open the Subbasin Manager dialog, select Workspace, then Edit Subbasins. 
Figure 7.1  Screenshot of the Subbasin Manager
The Subbasin Manager has the following tabs: 
• User Defined: Show, create, and edit subbasins defined by the user. User Defined Subbasins are displayed with a “U” icon next to their name. 
• Automatic: Show automatically defined subbasins including groups such as “Entire Network”, “Reaches”, “Reservoir”, “DataObj”, etc. Automatic subbasins are displayed with an “A” icon next to their name. 
• Object Membership: Show the subbasins to which an object belongs.