Here are some links that will help you:


Numbered Headings
Understanding styles | ShaunaKelly.com
Understanding Styles in Microsoft Word
Basic concepts of Microsoft Word: An introduction | ShaunaKelly.co


There is a some detail to get what you want and once you read through these links you should not find it too cumbersome. Don't try any shortcuts...they don't work. But, the first link (Numbered Headings) is probably more in line with what you are doing.


HTHs...