Need to cancel one out of two birth certificate

My wife's first birth certificate (Non Computerized) issued by Gram Paanchyat (Berai, Patepur, Vaishali, Bihar) in 2006 has date of birth different then Xth, XIIth and other certificate by 1 month. The date in birth certificate furnished mistakably and used unnoticeably in her first passport and 2nd renewed passport also. Now we want to move outside India and we think of making correction in the DOB of Passport to make everything consistent. I understand that in 2016 Government of India circular allow change in passport date of birth even after 5 years of passport issue. We get a new date of birth issued with corrected date. We came to know that Regional Passport office will require the proof of cancellation of first birth certificate before considering new birth certificate Valid. I also know as per 1969 Death and Birth Act , registrar can cancel and change certificate by making entry in margin or something. I also know that recent ruling from Honorable high court of Delhi (2022) we can get one of our birth certificate cancelled. https://primelegal.in/2022/02/23/one-of-the-two-birth-certificates-was-allowed-to-be-cancelled-in-absence-of-any-specific-rule-providing-for-the-same-high-court-of-delhi/ I want your guidance about exact steps (which office, what affidivit, which officer at division or subdivision) I need to take to get a proof of birth certificate cancellation which I can show at passport office.