Hi @Erin_Hommeland — Thanks for the feedback.
As an immediate solution, I’d recommend that you create an Advanced Search view that focuses upon both tasks & subtasks. You can then view this in a calendar view to see all levels of tasks in one spot. 
You can then favorite the search view (via the star) to pin it to your left pane and have it update automatically.
Here’s more info on Advanced Search — Using Search & Advanced Search in Asana | Product guide • Asana Product Guide
