Why yes, there are ways to do this (if I understand the problem). One method (I am assuming you want this to appear on every page):

1. Choose the View Header and Footer menu option.
2. Type the text you wish to use as your header.
3. Highlight the text.
4. Choose Insert Text Box
5. Word should open a new toolbar (Text Box), on which should appear a button to to change the text direction. Click it, and you will see that it flips the text 90 degrees.
6. Format the text so it is centered, move the text box wherever you want it to appear (I'm assuming to the far right of the page).
7. Resize the text box so that it takes up the entire vertical length of the page. Yes, Word will allow you to size the text box beyond the header's boundaries.
8. Format the text box so that it doesn't have any border lines.
9. Close the Header/Footer window.

Hope this helps.