Nadezhda Borisova, January 30, 2017January 30, 2017, 0 PageDiscussionHistoryDocumentation > How to add a sub-domainTo add a new sub-domain login to the MSPControl and click on Domains or go to Web > Domains. Click Add Domain. Choose a sub-domain. Type in its address, choose a parent domain from a drop-down menu and click Add Domain. Done!