public DefinitionQuery DefinitionQuery {get; set;}

{
    var createParams = new CatalogLayerCreationParams(new Uri(@"C:\CatalogLayer\CatalogDS.gdb\HurricaneCatalogDS"));
    //Set the definition query
    createParams.DefinitionQuery = new DefinitionQuery("Query1", "cd_itemname = 'PuertoRico'");
    //Set name of the new Catalog Layer
    createParams.Name = "PuertoRico";
    //Create Layer
    //Note: Needs QueuedTask to run
    var catalogLayer = LayerFactory.Instance.CreateLayer<CatalogLayer>(createParams, MapView.Active.Map);
}

{
    //Get the CatalogDataset of another Catalog layer
    var existingCatalogLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<CatalogLayer>().FirstOrDefault();
    if (existingCatalogLayer != null)
    {
        var catalogDataset = existingCatalogLayer.GetCatalogDataset();
        //Configure the settings for a new Catalog layer using the CatalogDataset of an existing layer
        var catalogLyrParams = new CatalogLayerCreationParams(catalogDataset);
        catalogLyrParams.Name = "NewCatalogLayerFromAnotherCatalogLayer";
        catalogLyrParams.DefinitionQuery = new DefinitionQuery("Query1", "cd_itemname = 'Asia'");
        //Note: Needs QueuedTask to run
        LayerFactory.Instance.CreateLayer<CatalogLayer>(catalogLyrParams, MapView.Active.Map);
    }
}