How to reduce the values of the building "drop down menu" to the "merged" content of of a result

Need help
1

Hello
How to reduce the values of the building “drop down menu” to the “merged” content of of a result.

image

For now I display a static choice .
Sans titre

I wish to display only:
LIBERTE1
LIBERTE2
ARC DE SEINE
AUSTERLITZ II

Thanks

2

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