How does ionic nest sub-routes?

  node.js, question

See the example of ionic. Ion-tabs are used, but there is no submenu at the top of my project.
Links to sub-pages (details pages) are within the page. For example. Click on the news headline to enter the details page. How can such a function set up sub-routes? Try $state(“news.detail”,{}) and add < ion-nav-view > to the sub-page to report an error.
Does anyone know how to set it up?

This has nothing to do with ionic, that isui-routeIt is only the use of, can define an abstract to save the data of the parent route, and then all other child routes.