Section versus page breaks (Word for Mac)

Do as indicated in the first paragraph of my previous reply. If you did that after combining the documents the Apply Changes option at the bottom of the Footnote ans Endnote dialog may not have been correctly set. Go through the process again but be sure Whole Document is selected.

I'm still struggling with section breaks, etc.

I'm writing a book chapter by chapter and will combine them into one document after I've written my chapters. I'm putting Endnotes citations in each chapter as I'm writing them. I want the Endnotes to stay at the end of the chapters as I incorporate each chapter into the final book format.

What kind of break do I use at the end of each chapter as I assemble them in the final document so that the endnotes stay with the chapter and not at the end of the book?

Sections control a huge amount of formatting. I try to cover it in the following long and rambling page that is full of links.

Sections / Headers and Footers in Microsoft Word (Ribbon Versions)

You may want to especially look at When to use Section breaks in Microsoft Word (and when to not use Section Breaks).

Do, though, look at both links that Bob gave you. Word can handle much work without using either [manual] page breaks or section breaks. Look into using Page Break before formatting, especially in heading styles.

This link is at the bottom of the page I referred you to:

How Sections Work

This is one subject that is common to both Mac Word & Word for Windows: I have no idea what document you're referring to but this is from Word Help:

Section Breaks

1. Next Page    Starts the new section on the following page.
2. Continuous    Starts the new section on the same page. This section break is particularly useful for documents that have columns. You can use it to change the number of columns without starting a new page.
3. Even Page    Starts the new section on the next even-numbered page. For example, if you insert an Even Page Break at the end of page 3, the next section will start on page 4.
4. Odd Page    Starts the new section on the next odd-numbered page. For example, if you insert an Odd Page Section Break at the end of page 3, the next section will start on page 5.

A Page Break simply cuts off the text at the spot where it is created so that any content that follows it is forced to the next page. They occur naturally based on margins, formatting, volume of content, etc. However they can be created manually but many experienced users suggest that manual page breaks are best kept to a minimum or avoided altogether.

There also are Column Breaks which are similar to Page Breaks & can be inserted into columns in a multi-column document to force the following content into the next column.