If the 3 extra attempts are to take place immediately (i.e. there is no other location in the schedule or it is not a few hours later), then it is best not to set a final event for that technical event.
You then indicate that there are 6 attempts. The jury then decides on the spot at the event which athletes will be given 3 extra attempts after 3 attempts.
If you use the Athletics.app Jury App, the jury app will automatically ask after everyone has had 3 attempts how many athletes will get 3 more attempts. Please note: the jury app will ONLY do this if you have specified that there are 6 attempts, otherwise the jury app will not ask this question after 3 attempts.
This has been automatically translated into English