Hi,
Such a complex title for a simple thing 
So, I used letsencrypt from the very beginning and I probably misused it from the beginning:
I have one domain, says domain.fr.nf (fr.nf is a domain name extension not declared public) and several sub domains, sub1.domain.com, …
I initially created one certificate for each subdomain. It worked fine but I find it hard to maintain (I need to change things in the apache config every time a renewal is needed)
So I’d like to change so taht all subdomains are “transferred” to the parent domain.
I know how to expand the parent cert to add subdomain but this creates new certs and I constantly get the “too many certs for this domain” because fr.nf is not declared as public.
So is there a way to transfer the existing certificate for the domain sub1.domain.fr.nf to domain.fr.nf without re creating it (which I can’t)?