Page Layout (tab)
Page Setup (group on Ribbon)
Margins (Button w/ drop-down menu)
Custom Margins (at bottom)
A dialog box launches


Multiple pages window is a place to pick "booklet fold"

Got it.
But I didn't done that when I was creating the file.
If there is a way to convert that to bookfold without making a new file?
Its done only with 6 columns and separeted in the middle with margins. I can upload the file so you can better understand that.

FILE > http://www.sendspace.com/file/g1emqz