HI Thao. I've moved your question to the PADS layout community where you should get a quicker response.
Hello snowball, this topic is covered very thoroughly in the following KB Article on Mentor's Support Center:
There is even an excellent video demonstrating how to do this.
PADS Support Manager
Thank you so much for your help.
Please discard my message this morning. I’m able to re-route a few nets of
my the board now. I missed to delete the rule of one net…..my fault.
From: Marty Fouch <firstname.lastname@example.org>
Sent: Monday, June 18, 2018 4:09 PM
To: Thao Ho <email@example.com>
Subject: Re: - Re: Pads layout xv.2.3
Mentor Graphics Communities
Re: Pads layout xv.2.3
reply from Marty Fouch
in PADS Layout - View the full discussion