You can Create a Parameter with A, B, C and ALL
and Set up Calculation Like This to use Parameter
WHEN "ALL" Then "False"
Drag it to Filter and Set as TRUE.
Gave you the Logic, but it will work.
I tried this it does not seem to work. I may be doing something wrong. When Ithe filter is All values it still shows up. It does not seem to recognize that All in the parameter and All in the filter dropdown is the same.
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Ok I will come up with an Example..Give me few mins