I have three different projects, I have to deploy these projects under single web app with different sub domains. I already purchased the custom domain. To deploy these project I have created three directories.
I have also setup the virtual directories in the app settings.
And I deploy the web part like this.
Now when I'm trying to access the web sub domain its showing me the default azure page
How can I access the projects on the basis of sub domains.
So I got an idea from Nancy comment. So you just have to update the virtual applications and the directories as follows.
Now I can access the web using https://web.example.com/
Thanks @Nancy.