Subtasks are smaller parts of tasks. Use subtasks when you need to break tasks down into more manageable parts. In the Task List, you can turn a task into a subtask by indenting it. You can also add a new subtask to the Task List.
If your Task List contains subtasks, you can turn a subtask into a task by outdenting it.
Use the Outdent and Indent buttons to promote (outdent) and demote (indent) tasks:
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To select two or more adjacent tasks, hold down the Shift key and then click the tasks. The tasks you promote or demote must be next to each other.
Or
Click the Indent button to demote the selected tasks.
You can also right-click an item in the Task List and then click Outdent or Indent on the shortcut menu.

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