Your question is a bit hard to understand.



But that is the whole purpose of styles.

You apply a style (Heading 1) to your text and then if you ever change the style (Heading 1) (eg from Blue text to green) then every piece of text that you have applied that Style to changes.

But yes of course you will have to manually apply the style to the text that you want on your 100 pages.

(If you had known about styles earlier you would/could have applied the Heading 1 style to the text as you created it!)

Thank you for your response! You replied to my question. Eventually I plan to use the TOC feature in Word which is based on heading styles and I was looking for easier way to go about it. But it looks like I have to go thru 100+ pages and manually apply style to each page.

The thing is that once you have applied the styles to those hundred pages, it will be easy for you to change the style later. Just one click it is will do all 100 pages!