To select a driver for a single intersection:
From Task Areas, select Manage Allocations, and then Driver Selections.
Under Stage, select the model stage that contains the intersection.
Under Driver, click the cell that contains the driver to be modified.
The drop-down and Common Selector button are displayed.
Click the selector button to display the Select Member dialog box.
Select the dimension member required for the specific intersection.
The driver selection is automatically saved and is displayed in the table.