Попробуйте:
Public Sub Combined()
Dim sht As Worksheet
Set sht = ThisWorkbook.Worksheets("Data")
sht.Range("A3:M3", sht.Range("A3:M3").End(xlDown)).ClearContents
With Worksheets("Raw Data").Range("RawTab1")
'copy everything from RawTab1 but not the first 2 rows
Dim Crng As Range
Set Crng = .Resize(RowSize:=.Rows.Count - 2).Offset(RowOffset:=2)
End With
sht.Range("A2").Resize(Crng.Rows.Count, Crng.Columns.Count).Value = _
sht.Evaluate("IF(ISNUMBER(--" & Crng.Address(0, 0, xlA1, 1) & "),--" & Crng.Address(0, 0, xlA1, 1) & "," & Crng.Address(0, 0, xlA1, 1) & ")")
End Sub