public ParcelEditToken CopyParcelLinesToParcelType( 
   ParcelLayer parcelLayer,
   SelectionSet sourceFeatures,
   Layer destinationLineLayer,
   Layer destinationPolygonLayer,
   bool markParentsAsHistoric,
   bool useSourceLineAttributes,
   bool useSourcePolygonAttributes
)

 string errorMessage = await QueuedTask.Run(async () =>
{
   // check for selected layer
   if (MapView.Active.GetSelectedLayers().Count == 0)
    return "Please select a source parcel polygon feature layer in the table of contents.";
  try
  {
    var myParcelFabricLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<ParcelLayer>().FirstOrDefault();
    if (myParcelFabricLayer == null)
      return "No parcel layer found in the map.";

     //get the feature layer that's selected in the table of contents
     var srcParcelFeatLyr = MapView.Active.GetSelectedLayers().OfType<FeatureLayer>().FirstOrDefault();
    string sTargetParcelType = "Tax";
    var destLineLEnum = await myParcelFabricLayer.GetParcelLineLayerByTypeNameAsync(sTargetParcelType);
    if (destLineLEnum.Count() == 0)
      return "";
    var destLineL = destLineLEnum.FirstOrDefault();
    var destPolygonLEnum = await myParcelFabricLayer.GetParcelPolygonLayerByTypeNameAsync(sTargetParcelType);
    if (destPolygonLEnum.Count() == 0)
      return "";
    var destPolygonL = destPolygonLEnum.FirstOrDefault();
    if (destLineL == null || destPolygonL == null)
      return "";
    var theActiveRecord = myParcelFabricLayer.GetActiveRecord();
    if (theActiveRecord == null)
      return "There is no Active Record. Please set the active record and try again.";
    var editOper = new EditOperation()
    {
      Name = "Copy Lines To Parcel Type",
      ProgressMessage = "Copy Lines To Parcel Type ...",
      ShowModalMessageAfterFailure = true,
      SelectNewFeatures = true,
      SelectModifiedFeatures = false
    };
    var ids = new List<long>(srcParcelFeatLyr.GetSelection().GetObjectIDs());
    if (ids.Count == 0)
      return "No selected parcels found. Please select parcels and try again.";
     //add the standard feature line layers source, and their feature ids to a new Dictionary
     var sourceParcelFeatures = new Dictionary<MapMember, List<long>>();
    sourceParcelFeatures.Add(srcParcelFeatLyr, ids);
    editOper.CopyParcelLinesToParcelType(myParcelFabricLayer, SelectionSet.FromDictionary(sourceParcelFeatures), destLineL, destPolygonL, true, false, true);
    if (!editOper.Execute())
      return editOper.ErrorMessage;
  }
  catch (Exception ex)
  {
    return ex.Message;
  }
  return "";
});
 if (!string.IsNullOrEmpty(errorMessage))
   MessageBox.Show(errorMessage, "Copy Parcel Lines To Parcel Type.");