Thank you for your reply. I will have to try it. I thought I tried that but could not get it to work. Probably a syntax error on my part. I will have to try it again. I broke the items down and wrote it as an if statement. It is a bit verbose but it works.
It's not exactly using "or" in a switch statement, but it is logically equivalent. The dropdown has values a, b, c, and d.
How it works: Since there is no "break" command inside of case "a", the switch statement continues through case "b", but doesn't do another check. It breaks from the switch when it sees the break command. Similarly, selecting "c" will get the same result as "d". (Since I control the options in the drop down list, the break is not strictly necessary, but I put it in anyway out of habit.)