I am playing around with a new project, a split view iPad app using Core Data, and I was wondering, as its fairly clear how to add and remove an item. If I
http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreData/Articles/cdFetching.html will show you how to fetch an entity,
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdUsingMOs.html will show you how to change properties, and save them.
core data is something where you really want to read a lot of the apple documentation and become familiar, it will save you hours in the long run. hope this helps!