Yes, I get how it's supposed to work, it's setting it up that way I'm struggling with. The options (radio buttons) are ambiguously labelled, as is the scope of their effect. Although I've tried every configuration, and I think I'm doing it right, I inevitably find my content is either duplicating, or missing altogether.
I realize my post is non-specific to the point of unanswerable. I've got to narrow down the steps I'm taking and document them so I can post them and ask specific questions.