Finally, if you are trying to do any automatic numbering, you need to follow the instructions in another of Shauna Kelly's pages.

How to create numbered headings or outline numbering in Ribbon Versions of Word by Shauna Kelly

Numbering in Microsoft Word

Microsoft puts a pretty package on Word. It looks easy but it is no more easy than a construction crane or a Mack Truck. There is a lot of complexity that MS tries to hide from the user.

As a shortcut, try running the Macro that Paul gave you on a copy of your document. See what happens. Installing Macros