When you are using the Task module, for your closing or DD Reviews, Litigation Project Management or Case Management the Main Task & Subtasks are now connected, which means the status for a task is changed when the following scenarios occur:
Auto Complete the parent task when all sub-tasks are completed
Change the status of the parent task back to In Progress when a new sub-task is added
This saves time managing more complex Task & Subtask work and will help to manage the task lists better as you cannot forget to complete the main task when all sub-tasks are completed.