You can add multiple reference lines on same chart. Have you tried it?
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thank you...working on...
when I create the calculated field with the Parameter,
WHEN "A" then .90
when "B" THEN .50
Error "expected float found string..."
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That error indicates the [OPS_Calc_measure_2] is a measure with a float value. So Tableau is trying to compare a float value to the string values of "A" and "B". This should be easily fixed by replacing the [OPS_Calc_measure_2] part of your calculated field with your parameter instead