To organize large projects into phases, grouped tasks, and so on in Gantt (Beta), you can create a hierarchy of project tasks by selecting one or more tasks in the Task Grid or Gantt Chart, and then indenting or outdenting them. You can also move one or more selected tasks freely by dragging them to a new location or level in the hierarchy.
The start date, end date and duration of a parent task reflects the details within its child tasks. If you move a parent task, its child tasks are also moved.
The tasks must be able to be moved. For example, you cannot move a task up or down a level if it is already at the top or bottom of the hierarchy.


When you have completed your changes, click Save.
Related Concepts
Project Planning Methodologies
Managing Project Tasks in Gantt (Beta)
Reference