On the home page of the console, click Command Control.
In the navigation pane, click Account Groups, then click Host Groups.
In the details pane, select the host group you want to delete, then click the delete icon next to the host group name.
To select multiple host groups, click Delete Multiple and select the host groups from the list.
Click Delete. The selected host groups are deleted and are also removed from any account group, rule conditions, and script entities in which they have been defined.