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Gets the parent IChartGroup that contains this series.
Use this property to access chart group settings shared by the series, such as group-level formatting and axis group options.
IChartGroup Parent { get; }
ReadOnly Property Parent As IChartGroup
worksheet.Range["A1:C4"].Value = new object[,] {{"Month", "Sales", "Target"}, {"Jan", 12, 30}, {"Feb", 18, 45}, {"Mar", 15, 40}};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:C4"]);
ISeries series = chart.SeriesCollection[1];
IChartGroup chartGroup = series.Parent;