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    <p>There are a few options:<br> 1. You can use <code>add&lt;Key&gt;Object:</code> on a NSManagedObject: </p> <pre><code>NSManagedObject *flightBoard = [NSEntityDescription insertNewObjectForEntityForName:@"FlightDepartureBoard" inManagedObjectContext:self.managedObjectContext]; NSManagedObject *details = [NSEntityDescription insertNewObjectForEntityForName:@"Flight_Details" inManagedObjectContext:self.managedObjectContext]; [flightBoard addCurrent_flightsObject:details]; </code></pre> <p>Although you will get a compiler warning unless you define the accessors in a category: </p> <pre><code>@interface NSManagedObject (Current_flightsAccessors) - (void)addCurrent_flightsObject:(NSManagedObject *)value; - (void)removeCurrent_flightsObject:(NSManagedObject *)value; - (void)addCurrent_flights:(NSSet *)value; - (void)removeCurrent_flights:(NSSet *)value; @end </code></pre> <p>2. Subclass. You can generate class files from your model which will include accessors for the to-many relationships:</p> <p><strong>FlightDepartureBoard.h:</strong> </p> <pre><code>#import &lt;CoreData/CoreData.h&gt; @class Flight_Details; @interface FlightDepartureBoard : NSManagedObject { } @property (nonatomic, retain) NSString * name; @property (nonatomic, retain) NSString * from_airport; @property (nonatomic, retain) NSString * to_airport; @interface FlightDepartureBoard (CoreDataGeneratedAccessors) - (void)addCurrent_flightsObject:(Flight_Details *)value; - (void)removeCurrent_flightsObject:(Flight_Details *)value; - (void)addCurrent_flights:(NSSet *)value; - (void)removeCurrent_flights:(NSSet *)value; @end </code></pre> <p><strong>FlightDepartureBoard.m:</strong> </p> <pre><code>#import "FlightDepartureBoard.h" #import "Flight_Details.h" @implementation FlightDepartureBoard @dynamic name; @dynamic from_airport; @dynamic to_airport; @dynamic current_flights; @end </code></pre> <p>3. You can get the mutable set and modify it using mutableSetValueForKey:. For example: </p> <pre><code>NSManagedObject *flightBoard = [NSEntityDescription insertNewObjectForEntityForName:@"FlightDepartureBoard" inManagedObjectContext:self.managedObjectContext]; NSManagedObject *details = [NSEntityDescription insertNewObjectForEntityForName:@"Flight_Details" inManagedObjectContext:self.managedObjectContext]; NSMutableSet *flights = [flightBoard mutableSetValueForKey:@"current_flights"]; [flights addObject:details]; </code></pre> <p>For more information, check out <a href="https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CoreData/" rel="nofollow noreferrer">Managed Object Accessor Methods</a>.</p>
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    1. POiPhone core data inserting new objects
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    1. COExcellent thanks I understand it now. I just could not quite see the solution from the documents.
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    2. COIf you found this answer or Adam's useful, please accept one of them.
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    3. COSorry still new to this site. Both answers were equally helpful in reality. Thanks for the help, much appreciated.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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