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Using outside name servers is fine but adds a level of complexity that Parcom cannot control. Subdomains become very problematic when creating or managing them via cPanel so using outside name servers for your domain is something you do at your own risk. Support level is minimized by our staff, and again is ok to do so long as you are a professional DNS server management person or consultant that understands name servers very well. Issues are minimized when one is very proficient in proper name server management in other words.
Related: Third Party Name Server Usage