[Koha] Adding new authority type

[diana soubra]

I'm trying to add new authority type that can be linked to name of production {tag 260$b}
 
I add authority type :PRO_NAME (production name), Auth field copied to 260.
 
when I save the new record, tag editor appears next to subfield 260$b, but I get empty result when searchin in the PRO_NAME.
 
What do I have to write in the summary so that the correct data appear?
 
Diana