Cloud Notes....syncing existing data?

I’ve been working through the Core Data Tutorial and applying some concepts in an app I"ve created. I was happy to see that enabling iCloud sync on my app wasn’t very complicated at all! However, I’m really struggling with one concept. At this point in time, my core data app already has existing data saved locally on the device. When I enable iCloud, that data disappears because the app is now using the iCloud data store and not the local data store. I realize that some sort of data migration needs to take place to migrate the existing core data store into the iCloud store, but I just can’t seem to get that right. Can anybody offer any advice or where I could look next? I have searched the web and found several Objective-C examples, but i’m having trouble applying those to my situation.

Thanks,
-Grant