New SIR for Waitlist decision

So I just got off on the waitlist for a UC, but I already submitted an SIR to another one. What is the step-by-step process to filing for the new UC and to withdraw for the old one? I know I don’t get my money back but what is the chronological process for doing this so i don’t mess up/get accused of filing for two at the same time?

If you cannot withdraw your SIR from the original UC through the student portal, then you need to contact admissions and withdraw your enrollment. Then you can SIR to the new UC and pay your enrollment deposit.

What is the SIR deadline for the new UC?

@Gumbymom UC I am gonna withdraw from is Davis, and into SB. Although both I see are excellent choices for my major, SB is overall more practical enough for me to consider it. I haven’t looked deep enough at the Davis Student Portal if there is an option to withdraw the SIR, and the deadline is the 8th for SB. Thanks in advance for your inputs btw, I still recognize you from several threads even back during high school.