By Her Grace question

I'm wondering how to tackle a new edition for a book. I'm updating the cover, changing the title, creating a new ISBN, and the content will have a new foreword as well as some light edits. How do I link the previous edition to the new one? (I don't have it ready yet-- I'm still waiting on the cover to be finished by Miblart, but once it's done and added to Ingram, I'll want to add the book to Goodreads). Do I just add the book, and ask to combine the editions?

Thanks.