Tableau: Multiple columns in a filter

Question

I have three numeric fields named A,B,C and wants them in a single filter in tableau and based on the one selected in that filter a line chart will be shown. For e.g. in filter Stages B column is selected and line chart of B is shown. Had it been column A selected then line chart of A would be displayed .

Pardon my way of asking question by showing a image. I just picked up learning tableau and not getting this trick any where.

Here is the snapshot of data

Answer 1

Create a (list) parameter named 'ABC'. With the values

A
B
C

Then create a calculated field

IF ABC = 'A' THEN [column_a]
 ELSEIF ABC = 'B' THEN [column_b]
 ELSEIF ABC = 'C' THEN [column_c]
END

Something like that should work for you. Check out Tableau training here. It's free, but you have to sign up for an account.