You need to contact vmware support and they will provide the scripts to remove it. It requires database manipulation.VMware KB: Deleting an endpoint in vRealize Automation (formerly known as vCloud Automation Center) ...
Thanks for your kind response.
After adding vCenter as Endpoint the delete option available to delete that one.
With that delete option not able to delete, then why they provide "delete" option in Endpoints. I don't know.
One question: where will i use that scripts in Postgres SQL or MS SQL (installed in Iaas Server)?.
After compute resource is added you cannot delete the endpoint. Below refer to below KB where they have mentioned the some information on support request.