Custom Proxy Subdomain

Hello, I have not found my happiness in the forum yet so I post a message: I would like to change the proxy cpanel.domain.com and webmail.domain.com to cpanel-server-1.domain.com and webmail-server-1.domain.com on server 1. I tried this: But without success where then I miss a crucial step and I would also like autossl to generate the certificates for these new proxies. Cpanel technicians told me to create subdomains but after that leads to the web space created for these subdomains and not the proxy. Do you have any idea how to customize proxies? I use the easy apache 4 version, with Apache 2.4, if you need anything make me a list. Sincerely, Julien