Task and subtask from record producer

I am trying to create a record producer that creates its own top level task and sub-tasks underneath it. The problem I have is that I'm not sure how to reference the main task created by the record producer with the script that creates the sub-task. Is this possible? I'm not sure about the order of how things are created, or if there is a way to access the sys_id of the task created by submitting the record producer within the script.