Sometimes you need to define parent-child relations between tasks in the Gantt Chart Web Part. If tasks list is selected as data source, user can select a task in the Virto Gantt Chart Web Part and add child task to it. If task has at least one child task, it is displayed as a summary task.
To add a child task, click a parent task on the right in the list. The “+ Child Task” button will appear. Ise it to create a child task the same way as you do for parent tasks.
To change the level of tasks, you can also use “Indent” and “Outdent” buttons. For example, I need to make the task “Task 333” a child of the task “Task 0022”. So, I click a task 333 and use “Indent” button.
Note: the “Add Child Task” and “Indent/Outdent” buttons are available only incase the list template chosen as a data source is a Tasks template. If note, the buttons do not appear.
Now the task “Task 333” is a child task of “Test 00222” task.
Note: to let parent-child relation possible for your Gantt chart, make sure you choose the list with basic parent ID field. If the SharePoint list you’re going to use as a data source is created in old SP versions or is a custom one, the parent-child relations may not work.