VPS DNS Manager vs Sentora DNS Manager - subdomains

[bazyl]

Hello.

I use Sentora on VPS Hosting.  I have no problems with adding subdomains via VPS DNS Manager  (via A/AAAA Records), but I can't achieve this effect via Sentora DNS Manager (neither via CNAME nor A records).  

I don't know where to start searching for the problem. Can someone please give some advice.

[bazyl]

I figured out that I need my own nameservers instead of nameservers given by hosting provider. So I'm setting up my own DNS server with two IPs.