Question about ns and custom domain

Hello everyone,
Im a bit confused with some tech question using my VPs in OVH
So, i have sometime using a VPS, for exmaple:
vps-84caXXXX.vps.ovh.net and it have the ip 193.xx.x.xx

I got my custom domain, mydomain.es, that is registered on another registrant, "dondominio.com"
mydomain.es uses glue records: ns1.mydomain.es ip 193.xx.x.xx and the ipv6 from my vps

Then, in my vps-84caXXXX.vps.ovh.net i got installed my cpanel, i access through my whm and check my dns zone manager.

If i set inside the dashboard of ovh, in my vps mydomain.es as a seconday dns then i cannot enter in to my whm vps-84caXXXX.vps.ovh.net:2087

Inside my whm, in dns manager, i have:
cdns.ovh.net. 86400 NS
vps-84ca4214.vps.ovh.net
cdns.ovh.net. 14400 A
213.186.bb.bb (where it comes this up?)

And:
ns1.mydomain.es. 86400 NS
vps-84caXXXX.vps.ovh.net
ns1.mydomain.es. 14400 A
-> my ip in dondominio.com!

and_
vps-84caXXXX.vps.ovh.net. 86400 NS
vps-84caXXXX.vps.ovh.net
vps-84caXXXX.vps.ovh.net. 14400 A
193.xx.x.xx


So, in my dns manager i have to delete vps-84caXXXX.vps.ovh.net. and cdns.ovh.net.?