We sell window film (tint) in full rolls from 20" - 72" long. We have dozens of types as well. One type in particular has three shades (charcoal, blue, and green) and all come in 60" lengths but the charcoal is also available in 48" (the green and blue are not).

I have the option values set at:

Color (charcoal, green, blue)
width (48" and 60")

How can I do this so the 48" is not available for the green or blue film (just the charcoal)?