Dynamic traffic shaping - how to setup?

[STDD]

I need to dynamically distribute BW up to 20 users
I found solution in previous topic
http://forum.pfsense.org/index.php/topic,8021.msg45170.html#msg45170
But, I don't understand how create this two queue.
I used wizard and modified, for example, penalty rules and queues.
But, shaper didn't restart correctly.
Is there anyone who can help me?