public void Create( 
   AssociationDescription associationDescription
)

// Creates a new feature by copying and optionally modifying the attributes of an existing feature using an inspector.
await QueuedTask.Run(() =>
    {
      // Create an inspector and load a feature
      // The inspector is used to modify the attributes of the feature before creating it
      var insp = new Inspector();
      insp.Load(featureLayer, objectId);
      // modify attributes if necessary
      // insp["Field1"] = newValue;

      //Create new feature from an existing inspector (copying the feature)
      var createOp = new EditOperation() { Name = "Create from insp" };
      createOp.Create(insp.MapMember, insp.ToDictionary(a => a.FieldName, a => a.CurrentValue));

      if (!createOp.IsEmpty)
      {
        var result = createOp.Execute(); //Execute and ExecuteAsync will return true if the operation was successful and false if not
      }
    });

// Creates new point features in the specified feature layer using data from a CSV source.
var csvData = new List<(double X, double Y, double StopOrder, double FacilityID)>();
//Run on MCT
await QueuedTask.Run(() =>
{
  //Create the edit operation
  var createOperation = new ArcGIS.Desktop.Editing.EditOperation() { Name = "Generate points", SelectNewFeatures = false };

  // determine the shape field name - it may not be 'Shape' 
  string shapeField = featureLayer.GetFeatureClass().GetDefinition().GetShapeField();

  //Loop through csv data
  foreach (var item in csvData)
  {

    //Create the point geometry
    ArcGIS.Core.Geometry.MapPoint newMapPoint =
        ArcGIS.Core.Geometry.MapPointBuilderEx.CreateMapPoint(item.X, item.Y);

    // include the attributes via a dictionary
    var atts = new Dictionary<string, object>
      {
        { "StopOrder", item.StopOrder },
        { "FacilityID", item.FacilityID },
        { shapeField, newMapPoint }
      };

    // queue feature creation
    createOperation.Create(featureLayer, atts);
  }
  // execute the edit (feature creation) operation
  if (createOperation.IsEmpty)
  {
    return createOperation.Execute(); //Execute and ExecuteAsync will return true if the operation was successful and false if not
  }
  else
    return false;
});

// attach an event handler to receive notifications when a new row is created in the
// associated table of the first feature layer found in the active map. Use this method to enable custom logic in
// response to row creation events within your ArcGIS Pro add-in.
// subscribe to the RowCreatedEvent
Table table = MapView.Active.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault().GetTable();
RowCreatedEvent.Subscribe(rowChangedEventArgs =>
  {
    // RowEvent callbacks are always called on the QueuedTask so there is no need 
    // to wrap your code within a QueuedTask.Run lambda.

    // get the edit operation
    var parentEditOp = rowChangedEventArgs.Operation;

    // set up some attributes
    var attribs = new Dictionary<string, object>
    {
      { "Layer", "Parcels" },
      { "Description", "objectId: " + rowChangedEventArgs.Row.GetObjectID().ToString() + " " + DateTime.Now.ToShortTimeString() }
    };

    //create a record in an audit table
    var sTable = MapView.Active.Map.FindStandaloneTables("EditHistory")[0];
    var table = sTable.GetTable();
    parentEditOp.Create(table, attribs);
  }, table);

// Attach an event handler to the <see cref="ArcGIS.Desktop.Editing.Events.RowCreatedEvent"/> for the table associated with the first <see cref="ArcGIS.Desktop.Mapping.FeatureLayer"/> in the active map. Use this method to monitor when new rows are created
// in that table, enabling custom logic to be executed in response to record creation events.
Table firstTable = MapView.Active.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault().GetTable();
RowCreatedEvent.Subscribe(rowChangedEventArgs =>
{
  // RowEvent callbacks are always called on the QueuedTask so there is no need 
  // to wrap your code within a QueuedTask.Run lambda.
  // update a separate table not in the map when a row is created
  // You MUST use the ArcGIS.Core.Data API to edit the table. Do NOT
  // use a new edit operation in the RowEvent callbacks
  try
  {
    // get the edit operation
    var parentEditOp = rowChangedEventArgs.Operation;
    // set up some attributes
    var attribs = new Dictionary<string, object>
      {
        { "Description", "objectId: " + rowChangedEventArgs.Row.GetObjectID().ToString() + " " + DateTime.Now.ToShortTimeString() }
      };
    // update Notes table with information about the new feature
    using var geoDatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(Project.Current.DefaultGeodatabasePath)));
    using var table = geoDatabase.OpenDataset<Table>("Notes");
    parentEditOp.Create(table, attribs);
  }
  catch (Exception e)
  {
    throw new Exception($@"Error in OnRowCreated for objectId: {rowChangedEventArgs.Row.GetObjectID()} : {e}");
  }
}, firstTable);

{
  await QueuedTask.Run(() =>
  {
    using (var kg_for_doc = kgLayer.GetDatastore())
    {
      var propInfo = kg_for_doc.GetPropertyNameInfo();
      if (!propInfo.SupportsDocuments)
        return false;

      var edit_op = new EditOperation()
      {
        Name = "Create Document Example",
        SelectNewFeatures = true
      };

      var doc_entity_name = propInfo.DocumentTypeName;
      var hasdoc_rel_name = GetHasDocumentTypeName(kg.GetDataModel());

      //Document can also be FeatureClass
      var doc_tbl = kg_for_doc.OpenDataset<Table>(doc_entity_name);
      var doc_rel_tbl = kg_for_doc.OpenDataset<Table>(hasdoc_rel_name);

      //This is the document to be added...file, image, resource, etc.
      var doc_url = @"E:\Data\Temp\HelloWorld.txt";

      // create the KnowledgeGraphDocumentDescription
      var kgDocDesc = new KnowledgeGraphDocumentDescription(doc_url);

      // if there is a geometry use the following ctor
      // var kgDocDesc = new KnowledgeGraphDocumentDescription(doc_url, doc_location);

      // if you have additional custom attributes 
      //var customDocAtts = new Dictionary<string, object>();
      //customDocAtts.Add("custom_attrib", "Foo");
      //customDocAtts.Add("custom_attrib2", "Bar");
      //var kgDocDesc = new KnowledgeGraphDocumentDescription(url, null, customDocAtts);

      // add additional properties if required
      kgDocDesc.Keywords = @"text,file,example";

      // The Create method will auto-populate the Url, Name, FileExtension and contentType fields of the document row
      // from the path supplied.  
      var rowToken = edit_op.Create(doc_tbl, kgDocDesc);

      //Get the entity whose document this is...
      var org_fc = kg_for_doc.OpenDataset<FeatureClass>("Organization");
      var qf = new ArcGIS.Core.Data.QueryFilter()
      {
        WhereClause = "name = 'Acme'",
        SubFields = "*"
      };
      var origin_org_id = Guid.Empty;
      using (var rc = org_fc.Search(qf))
      {
        if (!rc.MoveNext())
          return false;
        origin_org_id = rc.Current.GetGlobalID();//For the relate
      }

      // set up the row handles
      var originHandle = new RowHandle(org_fc, origin_org_id);    // entity
      var destinationHandle = new RowHandle(rowToken);            // document

      // create the KnowledgeGraphRelationshipDescription
      var rd = new KnowledgeGraphRelationshipDescription(originHandle, destinationHandle);

      // if you have additional custom attributes for the "HasDocument" relationship
      //var customHasDocAtts = new Dictionary<string, object>();
      //customHasDocAtts.Add("custom_attrib", "Foo");
      //customHasDocAtts.Add("custom_attrib2", "Bar");
      //var rd = new KnowledgeGraphRelationshipDescription(originHandle, destinationHandle, customHasDocAtts);

      // create the relate record using the same edit operation
      edit_op.Create(doc_rel_tbl, rd);

      //Call execute to create all the entities and relationship rows _together_
      return edit_op.Execute();
    }
  });
}

{
  // This routine creates a structural attachment association between a pole and a transformer bank
  static void CreateUNAssociation(UtilityNetwork utilityNetwork, AssetType poleAssetType, Guid poleGlobalID, AssetType transformerBankAssetType, Guid transformerBankGlobalID)
  {
    // Create edit operation
    EditOperation editOperation = new EditOperation();
    editOperation.Name = "Create structural attachment association";

    // Create a RowHandle for the pole
    Element poleElement = utilityNetwork.CreateElement(poleAssetType, poleGlobalID);
    RowHandle poleRowHandle = new RowHandle(poleElement, utilityNetwork);

    // Create a RowHandle for the transformer bank
    Element transformerBankElement =
      utilityNetwork.CreateElement(transformerBankAssetType, transformerBankGlobalID);
    RowHandle transformerBankRowHandle = new RowHandle(transformerBankElement, utilityNetwork);

    // Attach the transformer bank to the pole
    AssociationDescription structuralAttachmentAssociationDescription =
      new AssociationDescription(AssociationType.Attachment, poleRowHandle, transformerBankRowHandle);
    editOperation.Create(structuralAttachmentAssociationDescription);
    editOperation.Execute();
  }
}