The first step is to decide if you want to include a label with the number. For example, you might want the word “Chapter” to appear before the actual chapter number. If you want to include a label, type it in the Custom Page Numbering Format text box. Next, select a numbering style from one of the list boxes, and click the Insert in Format button to insert the numbering code in the Custom Page Numbering Format text box.
So now on the A master page in your Adobe InDesign document you should have a capital A in the text frame that we created. This is more than just a capital A though, this represents the A master in your Adobe Indesign document and it means that on every page that is attached to your A master the corresponding page number will appear in that position on your page.

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
If you go into Print Preview, the field will automatically update in the Headers or Footers. Unfortunately, if you also have the field in the main document, (for example, in the coversheet), going into Print Preview won't update it – but printing will, provided that you have Update Fields ticked under Tools + Options + Print. You can also update the field by selecting it and pressing F9. Or you can press Ctrl+A followed by F9 to update all the fields in the main document in one go.
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Suppose you’ve made some changes to the styles or swatches in your chapter 5 document, and now you want to use those updated styles or swatches throughout your book. Click in the column to the left of chapter 5 to set chapter 5 as your book’s style source. Select all the other documents that you want to synchronize to chapter 5 by pressing Ctrl/Cmd and clicking the documents (they’ll turn blue when selected).
So now on the A master page in your Adobe InDesign document you should have a capital A in the text frame that we created. This is more than just a capital A though, this represents the A master in your Adobe Indesign document and it means that on every page that is attached to your A master the corresponding page number will appear in that position on your page.

If you need to apply numbering within a paragraph rather than to the entire paragraph, you use Word's ListNum feature. Using the ListNum feature will allow you to take advantage of the numbering system you're currently using in your document (it will use the one you implemented most recently if you're not currently using a numbering system). The ListNum Field is available in Word 97 and later and interacts with multi-level list numbering (which should be linked to styles as set forth here). Here is a brief explanation of differences between the ListNum field and the Seq field.
If you start to type in what appears to be a numbered list, Word formats your manually typed "numbers" to an automatic numbered list. The main benefit of this option is that you do not need to click any button to start numbering and you can choose your numbering style as well. For example, if you type "(a) some text" and press Enter, it starts numbering using the "(a)" format.
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