I have a long, book length text file (50 chapters). It's one file in one ID chapter. I would like to make it 50 files in 50 ID chapters in one book (indb). Can that be easily done?
You can "move the pages" which make one chapter in your ID file in the new documents and then save the new file, similarly you can do it for the 50 chapters and then compile this 50 chapters together in a book.