Deleting Records in Form View
To permanently delete a selected record from a library:
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Choose Records > Delete Record or press Command-Delete.
In the dialog, click Delete.
 
To remove a selected record from a collection:
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Choose Records > Remove Record.
If you click Remove from Collection, the record is removed only from the collection, not the library. If you click Delete, the record is permanently removed from both the library and the collection.
Note  If you delete a record from the Address Book library, the record is also deleted in the Address Book application. If you delete a record from the iCal Events or iCal Tasks library, the record is also deleted in the iCal application.