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Great question! You can let the user select a parameter and, based on that selection, display a particular measure (variable) on a given chart. This article describes the process step by step: Swapping Measures Using Parameters | Tableau Software .Based on the data you shared, you'll probably want to use 'Option 1' two times.
Hope this helps!
Thanks for liking. If it solves your problem, maybe mark it correct
I got several good answers. "Liked" them both. I'm still working this through, trying to figure it out, so not solved for me quite yet. I did check "This helped me".