You can follow below steps to delete domains and subdomains in plesk:
- Login to Plesk.
- Click on “Websites & Domains” tab in Plesk. Here you can check all your hosted websites.
- If you are not getting all the options then click on “Show More” option in Plesk.
- You will find “Remove website” option to remove domains or subdomains in Plesk.
- To confirm the removal click on “Ok”. You’re all the subdomains, files, databases are also removed.