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Use the Field Dependency Matrix
The field dependency matrix lets you specify the dependent picklist values that are available when a user selects each controlling field value. The top row of the matrix contains the controlling field values, while the columns list the dependent field values. Use this matrix to include or exclude values. Included values are available in the dependent picklist when a value in the controlling field is selected. Excluded fields aren’t available in the dependent picklist for the selected controlling field value.

