What’s the difference between a task and a sub-task?

Tasks vs. Sub-Tasks in DailyBalance

In DailyBalance, there is no difference between a Task and a sub-task. Both are Tasks. The term sub-task just means a Task that exists as a “child” of another Task in the Master List. At any point, you can drag a sub-task out to make it its own Task. Or, drag a Task under another Task to make it a sub-task.

What about Projects and Folders?

See: How do I group tasks in a folder or project?