The topichead element provides a title-only entry in a navigation map, as an alternative to the fully-linked title provided by the topicref element.
Insert Topic Heading action from the main
toolbar (or from the Insert submenu of the contextual menu). Those actions open the Insert Topic Head dialog box that allows you to easily insert a topichead element. A Navigation title (navtitle attribute) is required but other attributes can also be specified from this dialog box (such as Type, Scope, Format, etc.)
Figure: Insert Topic Heading Dialog Box