How to set the SubTotal TotalList using a variant instead of an array

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Greetings! I am currently redesigning a workbook that is tracking the daily output of a number of wells. The original tracked 100 wells, but the new version could track anywhere up to 1000 wells. I have been trying to find a method of getting around typing up to 1000 column numbers into the TotalList:=Array (3,4,5,etc.) statement.

A sample of the worksheet looks like this:
43516-Sample-Data

After a lot of research I have created the following (Based on examples that appear to have worked for others) :

Code:

Sub WklySubtotal()
    Dim varCols()   As Variant  ‘array to hold column numbers
    Dim intCount    As Integer  ‘for..next counter
    Dim intMaxCol   As Integer  ‘number of columns to subtotaled
    
    Sheets(“Sheet1”).Select
    Cells(1, 3).Select
    Selection.End(xlToRight).Select
    intMaxCol = ActiveCell.Column
    
    ReDim varCols(intMaxCol – 2)
    
    For intCount = 3 To intMaxCol
        varCols(intCount – 3) = intCount
       ‘ Debug.Print intCount – 3, varCols(intCount – 3)
    Next intCount

    Selection.Subtotal Groupby:=1, Function:=xlAverage, TotalList:=varCols, _
    Replace:=True, PageBreaks:=False, SummaryBelowData:=True
‘    Selection.Subtotal Groupby:=1, Function:=xlAverage, TotalList:=Array(3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14), _
‘    Replace:=True, PageBreaks:=False, SummaryBelowData:=True
    
    ActiveSheet.Outline.ShowLevels RowLevels:=2
    Columns(“B:B”).Select
    Selection.EntireColumn.Hidden = True
    
End Sub

My sample data is based on 10 wells (the columns listed in the commented out section of code), and it works just fine when I use the version with the array values typed in, but when I try to run it using the varCols variant I get aRun Time error 1004 – Subtotal method of Range class failed.

The Debug statement has shown me that the right column numbers are in the variant array.

I am working in Excel 2013 on Windows 10, but I have been getting the same result in both Excel 2010 and 2016.

Any help is greatly appreciated (I cannot help but feel that I am missing some tiny little thing!)

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This change seems to work – I was looking to avoid a reference to the zeroth array element. At least I saw no errors
Norm

Code:

Sub WklySubtotal()
    Dim varCols()    As  Variant 'array to hold column numbers
    Dim intCount    As Integer  'for..next counter
    Dim intMaxCol   As Integer  'number of columns to subtotaled
    
    Sheets("Sheet1").Select
    Cells(1, 3).Select
    Selection.End(xlToRight).Select
    intMaxCol = ActiveCell.Column
    
    ReDim varCols(intMaxCol - 2)
    
    For intCount = 2 To intMaxCol
        varCols(intCount - 2) = intCount
       'Debug.Print intCount - 3, varCols(intCount - 3)
    Next intCount

    Selection.CurrentRegion.Select
    Selection.Subtotal GroupBy:=1, Function:=xlAverage, TotalList:=varCols, _
    Replace:=True, PageBreaks:=False, SummaryBelowData:=True
'    Selection.Subtotal Groupby:=1, Function:=xlAverage, TotalList:=Array(3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14), _
'    Replace:=True, PageBreaks:=False, SummaryBelowData:=True
    
    ActiveSheet.Outline.ShowLevels RowLevels:=2
    Columns("B:B").Select
    Selection.EntireColumn.Hidden = True
    
End Sub

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