In DailyBalance, tasks, sub-tasks, folders and projects are all just Tasks. See What’s the difference between a task and a sub-task?
Any Task can act as a “project” or “folder”. Say that you want to keep all of your Christmas shopping Tasks together. You can create a Task called “Christmas Shopping” and use that as a folder to keep all of your shopping Tasks together in the Master List. Some people think of this as a “folder” and others as a “project”. Either way, DailyBalance is built to be flexible so you can organize your stuff in any way that makes sense to you.