@lullu87 – you could export all pages to PDF, set up a new InDesign file with the new size and place that PDF scaled to the new page size.
Check Scott Zanelli's script for automatically placing multi-page PDFs.
Thanks....but I think after doing that I can't modify anymore...is it right?
I've heard something about the "page tool" and when I use it I can scale my page but the objects inside (text and images) remain the same as before..I cannot scale them...
@Lullu87 – of course you can modify the source of the PDF, your InDesign file, export again and update the links in the 23x23 cm sized InDesign file.
But we have alternatives for that workflow:
1. Place InDesign files instead of PDFs (yes, that is working!)
2. Alternative Layouts with Liquid Layout Rule "Size" (CS6 and above)
[NOT SO RECOMMENDED]
What I like to rule out is the Alternative Layout feature with Liquid Layout rules for sizing the contents page wide.
There are some good reasons not using that feature:
a. If using align to baseline grid in your paragraph styles: The scaled text will align to the grid also on the scaled pages. And that's nothing you really want. Baseline Grid is a feature that is document wide and not restricted to single pages or sections like Alternate Layouts.
b. IDML problems with the option "Scale" for pages, if you are using single-sided documents.
Details on that here:
[HIGHLY EXPERIMENTAL – SOME RISK INVOLVED]
Just for the sake of completeness what you are able to do, not recommended for every case and highly experimental. Read the disclaimer there. And do not try it on your original document but on a saved copy!
TotalRescale | Last-Minute Layout Adjustment
Before using it you have to change the margins, after using it you have to change the page sizes with the Pages Tool for achieving what you want.
Try this scripting solution it in your spare time ;-)