My Global "Max Drawer Depth" is currently :

=IF(W!Standard_Wood_Drawer_Slide_Selection="Blum Tandem Undermount Full Extension",21,20)

But I just added Grass Dynapro 16's and Grass Dynapro 19's to my drawer slides, and we currently use those 2 types.  How can I change the formula to reference the Dynapro's instead of the Blum Tandem Undermount?  Better yet, can it look for any of the three and return 21, otherwise 20?