Not sure I understand the OP intent, but it reminds me what @chaley implemented here:
https://www.mobileread.com/forums/sh...0&postcount=19
To use it, make a stored template named whatever you want -- I use "get_one_book_per_field_value".
BTW chaley has a great gift of simplifying instructions. For beginners, I would add this: to make a stored template, you need to open Preferences -> Template Functions.
After creating the stored template, paste this into calibre's search box then run the search:
Code:
template:"""program: get_one_book_per_field_value('authors')#@#:b:yes"""
(then create the catalog as Sirtel instructed)