Adding property to part family

Hi all

I have a problem with the family of a part located in a pipping element of the Solidworks library.

On other elements I succeeded, but not on this one.

I added a designation column in the Excel file, but I can't find it in the custom properties of the configuration.

I hope I am clear.

Thank you in advance.

Yours truly.
reducer.sldprt (8.2 MB)

Hello, I can't find the problem, can you share a file that works?

Yes, of course.
90deg lr inch elbow.sldprt (514.6 KB)