Is it possible for me to only point a sub-domain of mine to the nameservers on here so i can keep my existing dns server settings. because i currently already have a website on the root level of my domain but want to host a sub-domain on zymic.

use A Records

because i have it using NS records atm, but will an A record make a difference?

well you said you dont want to change the main site and only point a sub doamin over so use A Records to do it

well whenever i try to add a subdomain i always get a an error for wrong TLD

http://www.box.com/s/f7oqyd8drk8p03uysqx2

well first go to http://www.zymic.com/forum/index.php?showtopic=18617 to get the right A Records and just first put your TLD first then the sub domain

I wouldn't be able to have my existing site then if i change my root domain. isnt there a way to ONLY transfer a subdomain to zymic without changing any root domain stuff?

any response?

Is it possible or something, would like an answer sometime soon

like <your subdomain>.<your domain>.com ?
try point it by CNAME record

we dont support CNAME