🚀 go-pugleaf

I just had to change a trim size on a book also. 

I updated trim, gutter, etc. and the individual master pages for one chapter. 

Kept the original document open, and opened each file after. I went File, Import, Formats, and chose only Page Layouts. The page layouts from Ch01 automatically overrode the layouts (along with the master page layouts) on the master pages. 

If you then go to your master pages, and then back to body pages, choosing REMOVE OVERRIDES, your book will update with all of the new page formats. 

DANGER: Any manual manipulations that have been made--shortening or lengthening a page for alignment purposes, for instance--will be lost. A quick run through to restore original page depth will fix that. 

It was a bit cumbersome, but, I decided,  the lesser evil over updating all chapters, master pages, and then still having to manually manipulate any free floating boxes or modified text frames to the proper coordinates.