If the TimeLiner window is not already open, click Home tab Tools panel TimeLiner.
In the TimeLiner window Task tab, click the tasks you want to move:
Click Move Up to move selected tasks up one place the task hierarchy
Click Move Down to move selected tasks down one place the task hierarchy
Note: Tasks can only move within their current level of hierarchy. If the selected tasks are within a summary task, then they can only be moved up or down within the summary task.