Starting an auto-numbered paragraph is deceptively simple. See those buttons on the top row of the Paragraph section of the Home tab? The left-most one is for bullets; the next two to its right are for numbering and multi-level numbering, respectively. Simply click the button to toggle the feature on, or click on the drop-down arrow on each button to select a specific style. If you don’t like any of the delivered choices, you can click Define New to set your own.
Now, select the relevant page icon in the Pages Panel which represents the page you want to set as the first page of the second section of your document. In this example, this is Page 7 (which is currently numbered as vii). As before, go to the drop-down menu in the Pages Panel and select Numbering & Section Options… to open the Numbering & Section Options window. Again, check Start Page Numbering at, and from the Style drop-down menu select 1, 2, 3, 4… from the options available. Click OK.
In summary, paragraph numbering is really just an exercise in logic, and this blog post is showing the numbering styles for a very specific project. Your project may be similar, but not exactly the same. You just need to think though the levels and how you want to restart the numbers. I do my best to think it through correctly the first time, set it up, and then try as hard as I can to break it, so that I can find my errors. The good news is that once you get your numbers working, you shouldn’t ever have to think about it again.
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. I strongly recommend that you read both of these before doing anything with the contents of this chapter.