Hi James and thanks
I apologize if I messed up
I would like to store books by choosing the author via a selection box.
This means, for example, that the same writer who wrote more than one book may appear on more than one record books.
Example:
Joseph Conrad wrote Lord Jim and The Shadow Line. If I put on file the book Lord Jim, as a writer I have to put Joseph Conrad.
The same thing must I do to store The Shadow Line.
But I think it is not necessary to enter another time Joseph Conrad into the book data. In fact, if I have the authors archive, Conrad is already registered and you only need to choose him from a selection box, but will have to be dynamically linked to the archive authors.
This is what I would do and would like to know how to do it using ACF.
I hope I have clarified my request.
Carlo