Extending an Existing Series in the chart identified by the object variable myChart using the data in the cells P3:P8 on the worksheet named Chart Data:
Sub chartSource()
Dim myChartObject As ChartObject
Set myChartObject = ActiveSheet.ChartObjects.Add(Left:=200, Top:=200, _
Width:=400, Height:=300)
myChartObject.Chart.SetSourceData Source:= _
ActiveWorkbook.Sheets("Chart Data").Range("A1:E5")
myChartObject.SeriesCollection.Add Source:=ActiveSheet.Range("C4:K4"), Rowcol:=xlRows
myChartObject.SeriesCollection.Extend Source:=Worksheets("Chart Data").Range("P3:P8")
End Sub
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