VBA图表范围减去

Question

我找到了这个代码，每次运行时都会向图表添加一个额外的列。意思是第一次运行它显示第1-7周，第二次1-8，下一个1-9，我希望它显示2-7,3-8,4-9等。

Sub ChartRangeAdd()
On Error Resume Next
Dim oCht As Chart, aFormulaOld As Variant, aFormulaNew As Variant
Dim i As Long, s As Long
    Dim oRng As Range, sTmp As String, sBase As String

Set oCht = ActiveSheet.ChartObjects(1).Chart
oCht.Select
For s = 1 To oCht.SeriesCollection.count
    sTmp = oCht.SeriesCollection(s).Formula
    sBase = Split(sTmp, "(")(0) & "(<FORMULA>)" ' "=SERIES(" & "<FORMULA>)"
    sTmp = Split(sTmp, "(")(1) ' "..., ..., ...)"
    aFormulaOld = Split(Left(sTmp, Len(sTmp) - 1), ",") ' "..., ..., ..."
    aFormulaNew = Array()
    ReDim aFormulaNew(UBound(aFormulaOld))
    ' Process all series in the formula
    For i = 0 To UBound(aFormulaOld)
        Set oRng = Range(aFormulaOld(i))
        ' Attempt to put the value into Range, keep the same if it's not valid Range
        If Err.Number = 0 Then
            Set oRng = oRng.Worksheet.Range(oRng, oRng.Offset(0, 1))
            aFormulaNew(i) = oRng.Worksheet.Name & "!" & oRng.Address
        Else
            aFormulaNew(i) = aFormulaOld(i)
            Err.Clear
        End If
    Next i
    sTmp = Replace(sBase, "<FORMULA>", Join(aFormulaNew, ","))
    Debug.Print "Series(" & s & ") from """ & oCht.SeriesCollection(s).Formula & """ to """ & sTmp & """"
    oCht.SeriesCollection(s).Formula = sTmp
    sTmp = ""
Next s
Set oCht = Nothing
End Sub

我想要执行与此代码相反的操作，因此不应添加列，而应减去一列。如何修改代码来执行此操作？

（链接：VBA: Modify chart data range）

谢谢！