Assuming you’re working with the first sheet and you’re always stripping off the last two characters while leaving the first 5 characters, the following code will work:
Public Sub StripOff()
Dim iRow as Integer
iRow = 2 'Assuming row 1 is headers, else make this 1
While Sheets(1).Range("I" + Cstr(iRow)).Value <> ""
Sheets(1).Range("L" + CStr(iRow)).Value = Right(Sheets(1).Range("I" + Cstr(iRow)).Value, 2)
Sheets(1).Range("I" + Cstr(iRow)).Value = Left(Sheets(1).Range("I" + Cstr(iRow)).Value, 5)
iRow = iRow + 1
Wend
End Sub