Duplicating a book in Atticus is easy. Navigate to your home page, and click the three dots icon next to the book's title. A menu will pop up, and you'll find the option to duplicate the book.
To distinguish duplicate books, you can add a version tag on the book details page. To do this, open the book in Atticus, then click "Edit Book Details" in the top menu bar. When adding a tag to the version field for the first time, remember to press enter to save it.
After completing that step, you will be able to search for your versions on the My Books Tab or view the versions when using the list view on the My Books Tab.