title: How to make multiple child component and routes in angular 4
body: <p>i have to make one component with module like dashboard</p>
  
  <pre><code>dashboard.module.ts
  dashboard-routing.module.ts
  dashboard.component.ts
  dashboard.component.html
  </code></pre>
  
  <p>and i import dashboard.module in app.module.ts, after it again  i have to make child of dashboard like department</p>
  
  <pre><code>department.module.ts
  department-routing.module.ts
  department.component.ts
  department.component.html
  </code></pre>
  
  <p>and import department.module in dashboard.module.ts </p>
  
  <p>i am stuck at how to make child relation in routes like
   localhost:3000/dashboard/department</p>
  
  <p>without dashboard, department should not be load 
  means localhost:3000/department should not work</p>