How to Delete Subdomain in DirectAdmin?
In DirectAdmin panel on Host1Plus server:
To remove a subdomain, place a check next to the subdomain(s) you want to delete, then click the Delete Selected button. Next to the Delete Selected button is a checkbox called Remove Directory Contents. Check this box if you want the subdomain directory and its files to be deleted. If you don’t check the box, the subdomain will stop working but the files and directory will remain intact.