@ksilz, if this is a domain name registered via Netlify, please let us know as we do want to assist with any changes you want to make.
Domains registered through Netlify are not limited by Netlify in any way. If you want to use a domain registered via our service with any third-party (Digital Ocean, Heroku, AWS, etc) you definitely can do this and we are always happy to assist with any questions about this.
I’m reading back over the series of questions and it sounds like there is a domain name either registered with Netlify or using Netlify DNS (for example,
It sounds like you want to have a subdomain of this domain (for example,
test-app.mysite.com) which points to a Digital Ocean droplet/VPS/system/etc.
In most cases, this would be done by creating a DNS record which links to the droplet. This would normally be an A record if the droplet is referenced by IP address or a CNAME record if the droplet is referenced by hostname.
The DNS record might look similar to this:
test-app.mysite.com 600 IN A 192.168.1.1
Regarding SSL certificate for the subdomain, the SSL certificate is controlled by the server responding. If you are directing the subdomain traffic to the Digital Ocean system, then that service will need its own SSL certificate. There is no way to export the SSL certificate from Netlify and use it with a third-party service.