Using the Gantt view to create dependencies between tasks
To start a task, you often have to finish other tasks first.
Dependencies can either be set up by using the Predecessors
tab in the task edit dialog as shown above, or it can be
done graphically in the Gantt chart.  If you click on the
bar that represents the predecessor (and hold down the mouse button),
an arrow appears.  Dragging that arrow onto the bar that represents
the dependent task will create the dependency.  The Gantt chart will
immediately reflect the new relationship by shifting the dependent
task to start when the predecessor is scheduled to complete.  By
creating a dependent relationship this way,  always assumes a
Finish Start relationship with zero lag time.  You can modify this
relationship by opening the task edit dialog of the dependent
task, and selecting the Predecessors tab.
If you want to remove the dependency, you can select either
of the two tasks and delete the link by clicking the Unlink
icon on the toolbar, or by right clicking either task and
selecting Unlink from the pop up.
