Is it possible to limit the dovetail drawer height to 20".  20" is the maximum our machine can handle.

This is the formula for the height =Bottom_Drawer_Opening-Bottom_Drawer_Box_Bottom_Gap-Bottom_Drawer_Box_Top_Gap-IF(AND(Add_Bottom_Inner_Drawer=1,OR(Drawer_Qty=2,Drawer_Qty=3)),Bottom_Inner_Drawer_Box_Position,0) 

Could I add a conditional Statement , that if the value is <20 then the value =20 ?

or is there another way to handle this?