[destus]

sniffysko,

const routes: Routes = [
	{path: 'admin', component: ParentComponent,  children: [
		{path: 'path1', component: Component1},
		{path: 'path2', component: Component2},
		{path: 'path3', component: Component3}
	]}
];

c <router-outlet> в шаблоне ParentComponent - cамый правильный и надежный способ.