In Crema, Sidebar menu has 3 different components as below .
1. Menu Group
2. Collapsible Menu
3. Menu Item
Any Navigation Menu Item that is not associated with any group of navigations and does not have its children navigations is considered to be Individual navigation(Menu Item).
The Code structure of the Sidebar(Navigation Menu) as below
id: 'dashboards', // Id of the Menu Group
title: 'Dashboards', // Title of the Menu Group
messageId: 'sidebar.app.dashboard', // Localization id of the Menu Group
type: 'group', group/collapse/item // Type of menu of the Menu Group
permittedRole: RoutePermittedRole.admin, // Allowed to visible User Role
url: '/app/my-profile' // path of the menu navigation
children:  // children of the Menu Group
In above structure we can make any type of the menu by changing the type of object. It could be a group/collapse/item.