For example, if you change a parent task due date from July 1 to July 6, that is a change of five days so we'll also increase all subtask due dates by 5 days.
Enable Remap Subtask Due Dates
Owners or admins can enable or disable ClickApps with the following steps:
Click your Profile avatar
Ensure the Remap Subtask Due Dates ClickApp is enabled
Use Remap Subtask Due Dates
Change the due date of a parent task that has subtasks with due dates
You will be prompted to change the subtask dates, click Change subtask dates
Note: Remap Subtask Due Dates is not available when dragging and dropping tasks in Gantt view.