Xcode 4.3.2 To add a basic data structure.
Select Target-> Summary Pane-> Linked Framework and Libraries.

In the ABOVE image, the CoreData Framework has already been added. U can click the “+” button below it to add ur selection box.
ONCE U CICK ON Button "+" INCREASES BELOW THE PICTURE SCREEN.

To add new files to it, go to File-> New File → iOS tab-> CoreData setion.You can ur selection file

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