Here is a link that will help you with your numbering needs: Numbered Headings

Additionally, I view using "styles" in MSWord as an absolute must in creating documents. By reviewing your file, I can tell you are not using them. If you are so inclined to increase your overall use of MSWord, here are a couple (of many) links that will help you:
Understanding styles | ShaunaKelly.com
Understanding Styles in Microsoft Word
Tips for Understanding Styles in Word | ShaunaKelly.com

HTHs...