Sequence the order in which tasks must be completed by mapping the relationship between them via dependencies.
Parent Task - The first task in the sequence on which other tasks depend is called the parent task. The dependent tasks cannot be closed until the parent task is closed.
Child Task - Tasks dependent on the parent task are called child tasks.
Connector - The connection arrow used to link parent and child tasks.
In the Tasks tab, click Dependencies on the toolbar.

The Task Dependency page is displayed. Hover a task to preview the task details. The background color indicates the percentage of work completed so far.

Select a task and drag the connector to link a child task.

To delete a dependency, hover over the connector and click
.
On the page header, you can perform the following actions: