Select New from the Zones menu of the Reservoir System Editor. The New Storage Zone dialog will open ("Figure: New Storage Zone").
Figure: New Storage Zone
Enter a Name and Description for the new storage zone.
Click OK to close the New Storage Zone dialog.
When you have defined at least one system storage zone for your reservoir system, its name will appear in the white pane at the bottom left of the Reservoir System Editor, and a new set of fields will appear in the large gray area, as shown in "Figure: Configuring System Storage Balance". These new fields allow you to configure the system storage balance for your reservoir system.