Ok, I've done forum searching and wiki reading, and I've discovered how to check how a book (not the Bible) is indexed, by page, english headwords, etc.
I can't seem to figure out how to make one work out for me though. Let's take "131 Christians Everyone should know" as the book example, I think most have this resource. It is indexed by Bibliographic Item, Page, and English Headwords.
When I attempt to make a Reading Plan, it selects All Passages by default. So if my desire is to read the book in 131 days (a person a day), it only seems able to divide it by page numbers, so in a daily reading I end up with Table of Contents and a partial chapter, or something similar.
How can I attach a Daily reading to a heading/chapter? I found this here, but didn't understand it. Where is this entered at?