/SN001/SN-1.doc
/SN002/SN-2.doc
.
.
.
/SN080/SN-80.doc

Private Sub Document_Open()
'
' Document_Open Macro
'
'
    Application.OnTime (Now + TimeValue("00:00:02")), "ProcessActiveDocument"

End Sub

Sub ProcessActiveDocument()
    Dim BmkNm As String, BmkRng As Range, FileName As String
    BmkNm = "FileName"
    FileName = ActiveDocument.Name
    If InStrRev(FileName, ".") > 0 Then FileName = Left(FileName, InStrRev(FileName, ".") - 1)
    If ActiveDocument.Bookmarks.Exists(BmkNm) Then
      Set BmkRng = ActiveDocument.Bookmarks(BmkNm).Range
      If BmkRng.Text = FileName Then Exit Sub
      BmkRng.Text = FileName
      ActiveDocument.Bookmarks.Add BmkNm, BmkRng
    Else
      MsgBox "Bookmark: " & BmkNm & " not found."
    End If
    Set BmkRng = Nothing
End Sub

import os
import shutil

ref_dir_base = "C:/SN"
word_doc = 'SN-'
word_ext = '.doc'
ref_num = 1
ref_str = str(1000+ref_num)[1:]
begin_num = 2
stop_num = 12
word_exec = '"C:/Program Files (x86)/Microsoft Office/Office14/Winword.exe"'


for i in range(begin_num, stop_num+1):
    num_str = str(1000+i)[1:]
    shutil.copytree(ref_dir_base+ref_str, ref_dir_base+num_str)
    old_doc_name = word_doc + str(ref_num) + word_ext
    new_doc_name = word_doc + str(i) + word_ext
    new_path = ref_dir_base + num_str + os.altsep
    os.rename(new_path + old_doc_name, new_path + new_doc_name)


for i in range(begin_num, stop_num+1):
    num_str = str(1000+i)[1:]
    new_doc_name = word_doc + str(i) + word_ext
    new_path = ref_dir_base + num_str + os.altsep
    exec_param = '"'+new_path+new_doc_name + '"'
    exec_str = '"'+word_exec+' '+exec_param +'"'
    os.startfile(exec_param)