An individual needed to set up a simple link between their Bible and the Catechism of the Catholic Church. This simple task is a pain in the rear to put it politely ... and for a reason I had complained about in beta testing.
Problem 1: The Bible Passage Guide selection list does not include "Collections" although that is the only Guide section that provides the right function. So I have to create a guide with an unwanted section - I chose "Commentaries"
Problem 2: With the Commentaries section present, I find there is no "Add" function ... to get it to show, I must provide a reference and run the section that I didn't want in the first place. Now I can add the Collections section i.e. what I wanted in the first place, using Setting to point it to the Catechism of the Catholic Church, link it to my Bible and delete the unwanted Commentary section.
This is such an unnecessary convoluted mess that I consider it a bug, not a suggestion, that Collections be available in the Bible Passage Guides list.