1st level - 3spaces from start and punch 1
2nd level - 3space from there(1) and punch 2
3rd level - 19spaces from there(2) and punch 3
It would be easy to understand for you, if you create a structure indicator (edit mask) and then create a F/Locn (IL01) in Dev Client 100 or 220.
KJogeswaraRao