A subdomain is an additional part of your primary domain. Please, follow this tutorial to remove a subdomain in Plesk.
**1.** Log in to your Plesk account.
**2.** Click on **Websites & Domains **from the Sidebar Menu.
**3.** Under the list of **Domain names**, click on the **More icon** in front of the subdomain and select **Remove subdomain**.
**4.** Confirm with **Yes** to remove the subdomain.
The subdomain has been successfully removed in Plesk.