Note: If you are a developer, you would do much better to use a Document Variable rather than a Document Property (so that the user can't update the version without using your macros); and to write a version control macro assigned to an “Update Version” button to take care of updating the document variable, the “Last  Updated Date”, the revision history and the document's filename (and the filepath, if you have an archive strategy for old versions), as well as taking care of transitions between draft and live status. However, that is outside the scope of this article.
There are two ways to number the pages using the Book feature: manually or automatically. If you’ve set the starting page number in each document manually, those page numbers will appear in your Book file. There are, however, advantages to numbering your pages automatically. For example, say you decide to add a few pages to a chapter, or change your mind about the order of the chapters. With automatic page numbering, your Book file will adjust the page numbers accordingly whenever you make changes that affect the page numbering.
A defined list can be interrupted by other paragraphs and lists, and can span different stories and different documents in a book. For example, use defined lists to create a multi-level outline, or to create a running list of numbered table names throughout your document. You can also define lists for separately numbered or bulleted items that are mixed together. For example, in a list of questions and answers, define one list for numbering the questions and another for numbering the answers.
All of this happens in the Bullets & Numbering dialog box, shown below. You will definitely want to use paragraph styles for this. My first one is called Chapter title. You will need to begin by changing the List Type to Numbers for all of the levels, and you must both name the List and use the same named list for all Levels. You do this by selecting the List > New List.
Changing the numbering display affects how pages are indicated in the InDesign document, as in the Pages panel and in the page box at the bottom of a document window. The numbering display also affects how you specify page ranges when printing and exporting the document. However, the numbering display does not change the appearance of page numbers on document pages.

If PickleRick's answer doesn't work for you, then you probably have some sort of setting activated in your document which tells InDesign to create a new section when you use a different master page. I don't want to complicate things unnecessarily, so I am not posting instructions about that here, but let us know if you try implementing this solution and it doesn't seem to work and we can help you continue to problem solve (if you do so, it would be really helpful for us to see a screenshot of your pages panel). – magerber Aug 8 '17 at 17:42
All of this happens in the Bullets & Numbering dialog box, shown below. You will definitely want to use paragraph styles for this. My first one is called Chapter title. You will need to begin by changing the List Type to Numbers for all of the levels, and you must both name the List and use the same named list for all Levels. You do this by selecting the List > New List.
This simple technique makes quick work of a single-level numbered list and accommodates multiple lists within the same document. However, it doesn't work with multilevel lists. If you must work with an existing document, modify the heading style as shown above. Then, select each heading and apply the heading style that you modified by adding a numbering scheme. As I mentioned, this isn't possible if the existing document already employs the heading style. But if you face numbering headings in a document, you know you've got the request covered—and you won't lose a minute's composure. Just tell them, "Yes, I can do that."
This chapter (web page) takes you through how numbering is supposed to work in Word and the various controls. It is useful, but primarily on SEQ fields and simple numbered lists and also as reference showing the menus, dialogs and controls and going through the concepts for outline numbering. To actually set up outline numbering that works, refer to the Kelly and McGhie articles.
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