How to Create Your Own NS in DirectAdmin
To create your own (child) NS using the Direct Admin panel for the admin user:
- Go to the control panel as admin.
- Go to IP management, and select two IP addresses. Then in Assign to select the user and click Assign to.
- In the Access level menu, switch User Level. 
- Then switch to Reseller Level and go to Nameservers 
- Check the free IP and click Create. Select a domain from the dropdown list. 
- Delegate the domain from your registrar to ns1.your.domain.name and ns2.your.domain.name.
If you have any questions, please create a ticket to technical support.