Thanks Marvin, I've watched the video, but not exactly what I'm looking for...
Suppose I have the drop-down list {"Apples","Oranges","Bananas"}, I want the first column to be able to select either option from the drop-down. Suppose "Bananas" is selected, then for the next column I would like the user to only select between "Apples" and "Oranges"
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