Link to Thickness
The Link to thickness option in the Extrude PropertyManager lets you link the dimension of the present extrusion to the dimension of the existing extrusion to which it is coincident. If the depth of the original extrusion changes, the new one changes to match it.
This is available only when sheet metal features are present in the FeatureManager design tree. The Link to thickness option is useful in sheet metal parts because the part must be of uniform thickness.