I wrote a novel, a big one. Now after starting the third edit I have decided to break it into two novels. How easy is it to that? The only method I have found so far is to resave under a different name and then go into the original and delete the later chapters and then go into the new one and delete the earlier chapters. Is there a better way?
It sounds like a good approach!
Make sure you have a good backup.
Then create a new blank project, and drag and drop the chapters you want to move. Delete those chapters from the original project.
Whether this solution is better than the duplicate project solution depends on what fraction of the total material (including research) you want to move.
Katherine
I’d also add here that if the two novels are connected, e.g. one is the sequel of the other, you may want to keep it all in one project. It’s entirely possible to have multiple books in the same project and still compile them as individual books. You can organise this however you want–maybe create “Book One” and “Book Two” folders in the Draft, and then just select Book One or Book Two as the compile group.
The benefit to doing this rather than splitting into separate projects is that any reference material won’t have to be duplicated or kept up to date between two projects. You can also easily refer to events in the other book when you’re writing or editing or create internal links between the books in your notes or document references. (You can link to documents in another project too, but it’s simpler to link within the same project.)
Not everyone working on a series or such does prefer to keep everything in a single project, and there are various ways to handle this, but since no one else suggested it yet and I personally find it a really convenient way to work, I wanted to toss the idea out there. 
I use the “multiple books in one project” method outlined by Jennifer.
Have ghosted and edited series of books for writers/publishers in this way, and I have found it far easier to develop ideas with all the materials available in one project.
Sounds like the task I’m approaching. Having a feature film script and planning to adopt it to a 3x60 or 4x45 miniseries for television. Has anyone tried this, and found some clever way to approach it, please chip in. My approach so far is to keep everything in one project. As long as you are within Scrivener it works fine. Where it might get tricky is if you want to synchronise with some simple text-based iOS app. But perhaps that will be easier once we have the Scrivener for iOS…
Thanks for everyone’s feedback on this.
Glad I found this post. Yay search function! 
I keep two projects open at all times. One is a multi-book project, as described in this thread, with all the future books in my series so I can keep track of timelines as they are written (and I write scenes for them as inspiration strikes). The other is my story bible and also my daily writing journal. When I first started it, it seemed easier to keep them together. Now, it is a huge monster of a file which takes forever to save and close and also takes forever to open.
I had no idea you could drag and drop between projects! I started a new project for daily writing, and just did that for my file which contained October 2013 through December 2014. Wow. Scrivener is awesome. I don’t really need anything else. And I mean that. I just ordered a new computer, and I think all I need on it are Scrivener, MS Office, and an internet browser. And Dropbox. And I might try Aeon again. Scrivener and the internet are the only two programs I have open at any given time, though, unless I’m getting something ready in Word to send to someone.