Summary: Create a unique page style for each header and add them by adding page breaks.
- Format -> Styles and Formatting.
- Click on the ‘Page Styles’ button (the fourth along).
- Right click -> New.
- Give the style a unique name.
- On the Header tab, tick Header on.
- Go to the page before the one you’d like to have the style.
- Insert -> Manual Break.
- Select Page break and choose your style from the Style drop down.
More in depth explaination: HERE.
Taxonomy upgrade extras: