For example, if you change a parent task due date from July 1 to => July 6, that's a change of +5 days so we'll also increase all subtask due dates by 5 days.
How to enable this feature:
Go to ClickApps
Ensure the “Remap Subtask Due Dates” ClickApp is enabled
How to use this feature:
Change a parent task due date (that has subtasks with due dates)
You'll get this prompt below, just click change subtask dates