It seems to me that you need to be using Styles.
Urgently!
3. Using Styles to Format Text
Understanding Styles in Microsoft Word
Tips for Understanding Styles in Word by Shauna Kelly

Trying to use Word without understanding and using styles is like pushing on a string. I resisted learning and using styles for years and now regret every day of those years because although that string was still very hard to push, it kept getting longer and longer, and had some very important projects tied to it! Once you understand styles and the Word concept of organizing things into Chinese boxes everything falls into place and instead of pushing a string, you can push a button that turns on the very powerful text processing machine known as Microsoft Word and it will start doing your work for you instead of running around behind you trying to undo what you thought you just did.