I found something similar in this post (
https://www.mobileread.com/forums/sh...&postcount=537 ) to what I'm looking to do in my library but can't get it to work for me.
Let me explain I have personal identifiers in the ids field
and a personalized column of which store I bought the book.
What I'm looking for is that if the store custom column says Amazon, it only brings me the Amazon ids in another column.
It seems to me that it is the essence of that form but it brings me all the identifiers