In Book Creator, there is an option to duplicate a book.
The main reason for using this is to use a book as a template. It's also part of the student/teacher workflow. Let's image a teacher has created a template book that she wants to make available for all her students to work from.
The teacher creates the book in the class library. Students access the library and see the book (it will be in read-only mode). To edit the book, they need to first make a copy so they have their own version to work from.
Click the Books icon beneath the book you want to duplicate.
Choose Copy book. You may be asked which library you want to place the duplicate book in.
Here's the whole process, looking at the teacher/student workflow:
Make use of in-built templates in Book Creator
We've added a plethora of beautifully designed starter templates to Book Creator, which you can access by toggling between Blank Books and Templates after you click New Book.