Certificate of Entitlement to the Right of Abode

I'm a British citizen by naturalisation (2012). I wanted to apply for a British passport or Certificate of Entitlement to the Right of Abode
for my kids who were born in India and are staying in India with their mother. My daughter is almost 4 years old and my son is a few months old.

As a British parent, they want my original british naturalisation certificate.
If I'm applying for both of their Certificate of Entitlement to the Right of Abode
and BIO together, will I be able to provide my naturalisation certificate for both applications or do I need to apply separately and wait for the application to be successful and apply for the 2nd application.

Which documents do I need?

Has anyone gone through this process outside the uk?

thanks

You already posted yesterday, no need for multiple topics with the same question

british-citizenship/certificate-of-enti ... l#p2130971