How to assign a single record to multiple books?

Hello experts,

I have been reading about Books and it does seem that assigning a single record to multiple books is possible. I'm wondering though what sort of Book structure makes this possible? I have been playing around with a Book hierarchy where I can assign a child book to a record and therefore have access to that record through the parent Books of the child. I'm wondering though can I associate a sibling book to that record? For instance, if I have two top level (sibling) Books, North American Sales and South American Sales, can I assign both of those to