Macro to copy data from one workbook to others

How to change this code to copy data to existing workbooks (the only difference they are in .xlsm format, the names of files are 1.xlsm,...,50.xlsm) not to create new ones (all files are in the same folder)? And how to specify range lm = Range("B2,G2,L2") if there are more cells (every 5-th cell, starting from B2)?

Sub CopyM()
  Dim lm As Range, r As Long, c As Long
  Set lm = Range("B2,G2,L2"):  Application.ScreenUpdating = False
  For r = 2 To Cells(Rows.Count, 1).End(xlUp).Row
    Workbooks.Add
    For c = 0 To 4
      lm.Offset(r - 2, c).Copy Cells(r + c, 2)
    Next
    With Workbooks(Workbooks.Count)
      .SaveAs lm.Offset(r - 2, -1).Value: .Close
    End With
  Next
  Application.ScreenUpdating = True
End Sub