Saving Master Pages question & photo layout question

I am making a custom book theme (for instance at 8x8 inches) to use mainly for printing layouts. When I design a page template that I want to use multiple times, I have tried saving it "to document master" and "as a new document master". If I delete the book, the 8x8 theme is still saved when I make a new book, but the page template is not. Is there a way to save the page template into the theme without leaving the old book in my Aperture library?

Thanks for any help you can give.