You can't use Word's Numbering feature to generate a multilevel numbering system, even if you use built-in heading styles. Figure A shows a document with two styled heading levels: Heading 1 and Heading 2. You can apply the Numbering option (in the Paragraph group) and Word will number the headings consequently, but the feature ignores different levels; if you expected 1, 1.1, 2, 2.1, and 2.2, you might be surprised. If you select the entire document first, Numbering not only ignores the different levels, but it also numbers the paragraphs!
Next double-click your document for Chapter 1 in the Book file to open it. In your Chapter 1 document, you’ll manually start the page numbering at page 1, and switch from lowercase roman numerals to arabic numerals. So go to the Pages panel, click on the thumbnail image of the first page of the document to highlight it, then click Numbering & Section Options in the Pages fly-out menu. Select Start Page Numbering at, and type 1 in the adjoining box. Then select arabic numerals in the Page Numbering Style drop-down menu, as shown below. Click OK, and all the pages in the document will now be numbered with arabic numerals starting with number 1.

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Gus: I think chapter numbers only work when you have multiple documents in a book panel. You need to use File > New > Book to create a book panel. I strongly urge you to read up about how books and long documents work before you go any farther. I have a number of movies at lynda.com on this subject. If you don’t have a subscription, you can watch 7 days for free with this link: http://www.lynda.com/trial/indesignsecrets
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The easiest way to implement a numbering scheme for headings is to add one to a heading style. To illustrate, we'll modify Heading 1 by adding a numbering scheme. First, right-click Heading 1 in the Styles gallery (in the Styles group on the Home tab). Then, choose Modify as shown in Figure A to launch the Modify Style dialog. If you thumb through the default properties, you'll not find a numbering scheme (Figure B). Click the Format button and choose Numbering as shown in Figure B. If necessary, click the Numbering tab. Choose the predefined scheme that's the best match for what you want (Figure C).

You may wonder whether typing 1, 2, and 3 would be easier than using the ListNum field. Although doing that may be easier initially, the value of using the ListNum field becomes apparent when you cut and paste. When a paragraph contains multiple numbered items that you move or delete, Word automatically updates the ListNum fields. Using ListNum fields assures you of accurate numbering within a paragraph throughout the document.
In bulleted lists, each paragraph begins with a bullet character. In numbered lists, each paragraph begins with an expression that includes a number or letter and a separator such as a period or parenthesis. The numbers in a numbered list are updated automatically when you add or remove paragraphs in the list. You can change the type of bullet or numbering style, the separator, the font attributes and character styles, and the type and amount of indent spacing.
Drag the number, which Publisher defaults to “1,” into place on the ticket. To change the sequence, such as to start with “100” instead of “1,” click the “Page Number” button again and choose “Format Page Numbers.” Click the “Start this section with” radio button and type the new number into the field. Click the “OK” button to have Publisher update the ticket number.
When you're working on a document such as a magazine or a book with many pages in it, using the master page feature in Adobe InDesign CC 2015 to insert automatic page numbering simplifies working with the document. On a master page, you designate the position, font, and size of the page numbers and any additional text you want to accompany the numbers such as the magazine name, date or the word "Page." Then that information appears on every page of the document along with the correct page number. As you work, you can add and remove pages or rearrange entire sections, and the numbers remain accurate.

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
See Word's Numbering Explained by John McGhie, MVP - comprehensive and not pretty (Downloadable pdf file in letter size) - Reading this is vital to anyone attempting to use automatic numbering or bullets in a law office setting or other places where the documents are likely to be reused or heavily edited. See also How to Create a Template with a downloadable template with style-based numbering.
Tip: Page numbers are printed on the top or bottom line in the text area of the page, not in the margin space. WordPerfect inserts a blank line to separate the page number from the rest of the document text. This reduces the amount of text that would normally fit on the page by two lines. If you decrease your top or bottom margin (depending on where you put the page numbers) to approximately 2/3 inch, you can regain the lost space, and the page numbers will appear to print in the margin space.
There are three settings we need to embed in this field. The first is to tell it what kind of numbering we want to do (in this case, “First, Second, Third”), what case we want to use (upper case, title case, etc.), and a switch to tell Microsoft Word to increment the numbers. Click each of these settings as shown below, being sure to click Add to Field after each one:
To modify the options, click the Multilevel List option (in the Paragraph Group). Word selects all lists currently in use in the List Library. You'll see two options below the gallery: Define New Multilevel List and Define New List Style. Use the first to create and save a stable custom list style. You'll use the second to change list styles. You can also use the latter to create a new style. So, what's the difference? The Define New List Style option lets you name a style, so you can share, modify, and delete it later. Most users will never need this option. Now, let's move on: choose Define New Multilevel List. Figure D shows the resulting dialog. document numbering in coreldraw
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