https://indesignsecrets.com/breaking-up-pages-with-the-page-tool.php
Cari Jansen November 2, 2010
Unfortunately you’ll need to work with a non-facing pages document layout for the trick I’m about to show to work…
Obviously this is a super tedious task, if you are creating a longer document. So my advice would be to set-up most L-R spreads in advance, before starting the actual layout work.
You can now spend some time putting the layout together and submit PDF proofs in spread format (Select the Spreads check box in the Export Adobe PDF dialog to generate PDF spreads).
When it is time to submit individual pages with bleed on 4-sides to the printer:
It’s now time for the break-up … I know break-ups are never easy ;-) but remember… once they’re wire-o bound they will be together once again ;-)
This ensures that when the right hand pages are being moved away from the left hand pages, the content on those pages will move with the pages. Let’s assume I want to move the pages about 10mm apart from each other.
The result is that the page spreads still appear next to each other in your layout, but now have a 10mm gap between the pages. I think that’s kinda cool! ;-)
All that needs doing now is for you to go through the document and expand any artwork to the bleed guides in the spine area before creating the finished art PDF to your printer.