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     エラー処理は全くなので参考程度で。 
Sub Sample() 
  Dim Dic, buf, Keys 
  Dim i As Long, j As Long, cnt As Long 
  Set Dic = CreateObject("Scripting.Dictionary") 
  cnt = Range("a65536").End(xlUp).Row 
  Application.ScreenUpdating = False 
  For i = 2 To cnt 
    buf = WorksheetFunction.RoundUp(Cells(i, 1) / 1000, 0) 
    If Not Dic.Exists(buf) Then 
      Dic.Add buf, buf 
    End If 
  Next i 
  Keys = Dic.Keys 
  For i = 0 To Dic.Count - 1 
    Worksheets.Add after:=Worksheets(Worksheets.Count) 
    ActiveSheet.Name = Keys(i) 
  Next i 
  With Worksheets(1) 
    For i = 0 To UBound(Keys) 
      For j = 2 To .Range("a1:a" & .Range("a65536").End(xlUp).Row).Rows.Count 
        If Left(.Cells(j, 1), 2) * 1 = Keys(i) Then 
        .Cells(j, 1).Copy Worksheets(i + 2).Range("a" & Worksheets(i + 2).Range("a65536").End(xlUp).Row + 1) 
        End If 
      Next 
    Next 
  End With 
  Application.ScreenUpdating = True 
  Set Dic = Nothing 
End Sub 
 
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