Subtasks come in handy when a strict control is required over complex and sophisticated tasks. Such tasks can be split into several simple ones and assigned to different employees for greater flexibility.
There are several ways to add a subtask:
When viewing a task, click More > Create subtask.
When viewing a task, click Add > Create subtask.
When creating or editing a task, click More > click Add in the Subtask of field and select a task that the new one will be the subtask of.
In the Task list, you can click the hamburger button and select Create subtask to add a subtask for the chosen task.
In the Gantt chart, open the actions menu of a task and click Create subtask.
Derive task dates from subtask dates
When you work with subtasks, it may be significant to calculate the planned start and end date for the main task based on the dates specified for the subtasks.
To do that, when creating a new task or editing an existing one, click Options > enable the Derive task dates from subtask dates option.
The start date (for main task) will be set to the earliest start date across all subtasks. The end date (for main task) will be set to the latest end date of the connected subtasks.
What happens when all the subtasks are completed
You may need to auto complete the parent task when all the subtasks are completed.
To do that, when creating a new task or editing an existing one, click Options > enable the Auto complete task when all subtasks are completed (and vice versa) option.