alternating edges left and right

Hi!

I want to format my book to have alternating margins left and right (as in on the inside and outside of the book when two pages are seen together).

page 1: left 2cm, right 1,5cm

page 2: left 1,5 cm; right 2cm and so on.

the only way I seem to be able to do this in PAGES 5.5. is by using section breaks. This would be fine by me if I only wanted to use it for a print version. But I have to upload the same pdf for my Print AND ebook.

Now I'm worried that the section breaks will show in the ebook file and the text is all split up.

Is there a way to work around the section breaks in Pages and still get the alternating edges?

Thanks for your help!