Can we control global variables in a family table?

Hello

I  would like to make the global variables appear in my family table.

 but I can't do it.

Kind regards 
Bruno

Is there really an interest in going through a global variable if you create a family of parts?

Why not replace your global variable with a property in your room family?

For me there is no solution to control this global variable from a family of parts.

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Hello badenis,

the file already exists with equations

I found my answer: 

https://youtu.be/5kA2YqS7dcg

$VALUE@Longeur@equations

 I do a test before validating the answer

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EDIT on the subject