In a pivot table : how to hide 2rd level columns for some 1st level columns ?

[elodie-sta]

(Sorry in advance, English isn't my primary language)

Hello everyone, 

I'm facing a particular issue : I have a pivot table in which the first elements of the Columns part are "Values" from the measures I've added (it was generated automatically) and the second element is a normal dimension "Motif de sortie".

I need to make sure that the columns of my "Motif de sortie" elements hide for some columns of my 1st dimensions (Values). 

For example, I have 3 columns of Values : a, b and c and for "Motif de sortie" I have the columns 1, 2, 3

I want b and c to have the columns 1, 2, 3 but not a.

Do you have a solution for this ? I thought about using "Show column if" but I don't know how to select the "Values" element in the expression

[Chanty4u]

You can use this in show column if 

=IF(Match(Only([Values]), 'b', 'c'), 1, 0)

[elodie-sta]

In the expression do you replace the "Values" element by something else ?

Because as such, it doesn't work for me