hi, is it possible to point my subdomain to different NS ?? something like this domain.net will point to ns1.domain.com and subdomain.domain.net will point to ns1.anotherdomain.com
If you have a VPS or dedicated server you can do it by editing the BIND configuration file. But if you are on a shared hosting service and you cannot do it through your control panel then it is possible from your registrar service. In such case you need to use their nameservers and point the A records to your hosting and add from there as many A records as subdomains are needed even if pointing to another service.