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.
Almost everything I learned about Word's numbering I learned from the Word newsgroups (especially the Microsoft Word Numbering newsgroup) and from the MS Word MVP FAQ site. The contributions of John McGhie (especially his article about Word's Numbering Explained on the MS Word MVP FAQ site) and Dave Rado are significant. The current page represents a mere summary and application of some of that work.
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.

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). document numbering in word