Remote DNS host

I have hestiaCP up and running with many domain and DNS settings.
For remote DNS host (server 2)
Do I need to create a username slave and also a subdomain like also does the remote tld need to be marked as child?

I’ve setup this along time ago but can’t remember all the steps. The cli instructions really don’t tell the complete story, just the command to issues. Is there anywhere that gives all setup steps?

Thanks in advance!