To add a new site to your existing Django project, use the startapp task of manage.py utility.
To add a new Django application to an existing project
From the main menu, choose Tools | Run manage.py task
In the Django Console dialog, type startapp. Note suggestion list that appears under the dialog after entering the first letter, and shrinks as you type to show the exact match only.
Type the name of the new Django application.
Inspect the project structure. You should see the directory and the dedicated file created for the newly registered application.