I want to be able to create sub tasks to a parent task on Trello using Big Picture. However, the way it is displayed in my Gantt Chart is not the same as what I am seeing in tutorials. So far my Gantt Chart looks like the image below:

I would like to have my Gantt Chart look similar to this image below where the subtasks are visible and the grey bar represents the highest level and there are subtasks associated with it:
