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
At this point, you could click OK and start your document. But, let's modify the scheme instead. Click the Define New Number Format button. In the resulting dialog, click the Font button and choose Chiller from the Font list and click OK (only once). Click inside the Number format control—to the left of the example character—and enter Heading, as shown in Figure D. Click OK twice. If you check the properties now (Figure B), you'll find a numbering scheme. Click OK once more to return to the document. Heading 1 in the Styles Quick Gallery displays the new numbering scheme.
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- With InDesign Books you can set the numbering styles and values for pages, chapters, sections, and lists and have those numbers update automatically when the length or order of your documents changes, so let's check it out. The numbering options are found in the Book panel menu and there are Book Page Numbering Options and Document Numbering Options. Let's take a look at each of these. First we'll take a look at the document page numbering options and in order to choose this you have to have exactly one document selected in your book panel. If the document was closed it opens. In this dialog box you'll see all the settings that are in the Numbering and Section options dialog box that you can open from InDesign's layout menu or the pages panel. You can also just double-click on a page range to open this dialog box. Documents added to a book will number their pages and chapters sequentially with Arabic numerals unless you change those settings using either the numbering and section…
A best practice that we recommend to our clients is to create a base/folio master –with styled and positioned footers and current page number special characters– on which all other masters are based. This allows a footer that may contain date or issue information to be updated once and the changes are reflected in all of the master pages. If your masters only have current page number special characters then you can just add them to each master and the page numbers will be reflected when each master is applied to your document pages. document numbering in indesign