See below for deleting Authorities from Certificate Manager. 

Certificate Manager will preserve all the certificates associated with the removed Authority but no longer update their status.

To deleting Authorities

  1. Log in as an administrator with the required permissions. 

    See Browsing roles for the permissions granted to each ad administrator role.

  2. Go to Control > Authorities.
  3. In the main grid, select one or more Authorities.
  4. Click Delete to remove the selected Authorities from Certificate Manager.