Managing domains in Plesk is similar to cPanel. To add a new domain, go to Websites and Domains tab and select Add New Domain. Specify the required details and Click OK to complete. To Add a subdomain, select Add new Sub Domain and specify your desired subdomain and click OK.
To Manage DNS settings, go to Websites and Domains and select DNS Settings, there you can find various tools to add, modify or revert the DNS settings.