It is not possible to directly modify DNS entries for these environments, but it is possible to ask the PS Hosting team to create external entries.
To do this, create a ticket to PS Hosting support with the domain name(s) to be configured and on which environment this/these must be configured.
It is also possible to modify a domain name to add restrictions based on IP addresses or basic HTTP authentication.
Once configured, we will send you the CNAME record configuration to set up on your registrar.