Subservers and SSL

So I have a site that was originally created as a subserver, but I need it to be a top-level server with an SSL certificate.

I tried to change the domain name, this gave me the correct domain name, but I am not able to manage SSL certificates as the server is still treated as a subserver to the former parent server. Virtualmin will only let me manage SSL for the former parent.

Is there any way I can convert the server to be a top level server with its own SSL certificate, independent of the former parent?