If you're making double-sided booklets, then click on File | Page
Setup | Margins | Gutter: 0.25" or whatever amount of binding
space you want | Multiple pages: Mirror margins | OK.

If you're making single-sided booklets, then you can simply
increase the left margin setting in File | Page Setup | Margins.

Sue wrote:

I am putting together a booklet that will be bound on the left side. I can
change the left margin of the text to allow space for the binding. How do I
get the border on the left hand side to move over to the right a little bit
to allow for binding?

Thanks