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Autofill in Excel with VBA repeatedly in same column

I have some Excel files with a few million records between them, and they are grouped by source filename. I would like to write a VBA macro that places the source filename of each record in the first column so they will be easy to trace when I combine them into a database.

I am assuming the best way to do this is to use autofill coding on some sort of loop but I'm having trouble with the autofill part. The files are laid out exactly like in the exampleData tab in the attached file and I would like it to look like the solution tab. Thanks!
exampleData.xlsx

nutsch

Try this code:

Sub quickcleanup()
Dim rg As Range
Set rg = Range(Cells(3, 2), Cells(ActiveSheet.UsedRange.Rows.Count + ActiveSheet.UsedRange.Row - 1, 2))

Application.ScreenUpdating = False

With rg

    .AutoFilter field:=1, Criteria1:="=C:\*"
    .Offset(, -1).SpecialCells(xlCellTypeVisible).FormulaR1C1 = "=RC[1]"
    .AutoFilter

    .Offset(, -1).SpecialCells(xlCellTypeBlanks).FormulaR1C1 = "=R[-1]C"
    .Offset(, -1).Value = .Offset(, -1).Value


    .AutoFilter field:=1, Criteria1:="=C:\*"
    .SpecialCells(xlCellTypeVisible).Offset(, -1).ClearContents

End With

Set rg = Range(Cells(3, 2), Cells(ActiveSheet.UsedRange.Rows.Count + ActiveSheet.UsedRange.Row - 1, 2))

With rg
    .AutoFilter field:=1, Criteria1:="=~***"
    .SpecialCells(xlCellTypeVisible).Offset(, -1).ClearContents
    
    .AutoFilter
End With

Application.ScreenUpdating = True

End Sub

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Thomas

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nutsch

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dzielinski

ASKER

Clean and quick. You are awesome, nutsch. Thanks!

nutsch

Glad to help. Thanks for your appreciation.

Thomas