How to update a drop-down based on the value selected in another drop-down with tokens?

Let's say I have two drop-downs. The first drop-down represents a set of trials. Let's say there were three trials. The second drop-down represents runs in each trial. Trials drop-down: All 1 2 3 Tests drop-down: All 1A 1B 1C 2A 2B 2C 3A 3B 3C Is there a way to update the trials drop-down based on the Tests drop-down? Meaning if I select "1A" from Tests, that the Trials drop-down would change to "A" and display that value? All should be the default setting when the dashboard loads, but that's throwing me off with selectFirstChoice