You’re welcome 
There were already a topic asking to show subtasks (see Ideas/Feedback to display subtasks), and it has been closed, I guess Asana Team is working on that point.
If you give a glance to this topic, there are some tricks given at the beginning.
However, I totaly agree subtasks should appear more clearly. In my company, we avoid using them for the moment, and we use sections and custom fields a lot instead.
Julien