Generate Server Certificates

I’m not certain I am asking this correctly. In eDirectory iManager I can create a server certificate. I choose a Nickname and the server I want the cert installed on. The result is O=Nickname.CN=server.domain.com. I can then export in PKCs12 format.
Our Developers have an app that needs a cert to this server using a DNS name. How do I do that?

SLES 12 sp5

Thank you.