How can I delete custom stationery?
FAQ 6.12
6.12 How do I delete a specific piece of stationery?
The correct way is to move the "my stationery.one" out of the templates
folder and into your My Notebook folder, then delete the page you want
to remove, close the section and move it back to templates. To delete all
custom pages, just delete the file from templates.
Templates is a hidden folder here: C:\Documents and Settings\username\Application
Data\Microsoft\
(Thanks to MVP Diane Poremsky for this answer)