Question Manage only one subdomain

[CobraArbok]

I have a domain with related webapplications on a server.
Then we find at the IP address 11.22.33.44:

• www.mydomain.tld
• webapp-1.mydomain.tld
• webapp-2.mydomain.tld

I would like to manage webmail on a second VPS on which Plesk Onyx is present.
Then at IP address 99.88.77.66 we find:

• webapp.mydomain.tld

But I can't understand how I can do it because in Plesk I have to first create a domain and only then can I create a subdomain.

The first server is the "master" name server and therefore I would configure the Plesk in the second VPS as a DNS slave.

Thanks in advance for every referral and help.

 

[Ales]

... But I can't understand how I can do it because in Plesk I have to first create a domain and only then can I create a subdomain.

Just enter the entire subdomain in the form field where you'd usually enter the domain.

In other words, instead of creating an example.com domain, create a sub.example.com domain.