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Returns an instance of ISparklineGroups which may be used to get and set SparklineGroups properties of the cells.
ISparklineGroups SparklineGroups { get; }
ReadOnly Property SparklineGroups As ISparklineGroups
worksheet.Range["A1:A3"].Value = new object[,] {{1}, {2}, {3}};
IRange location = worksheet.Range["B1:B3"];
ISparklineGroups sparklineGroups = location.SparklineGroups;
sparklineGroups.Add(SparkType.Line, "A1:A3");
int groupCount = sparklineGroups.Count;