Follow steps given below to add a sub-domain in DNP:
1.Login into DNP Control Panel
2.Click on hosting Spaces Name
3.Click on Domains
4.Click on Add Domain
5.Click on Sub-Domain Radio button
6.Enter the Sub Domain Name, Select the Domain name on which you want to create Sub Domain and Click on Add Domain button
7.Now Click on Web Sites
8.Click on Create Web Site
9.Select the Sub Domain Name for which you want to create website on server
10.Click on create web site button