Hey Karen,
This rule can be set with the automation:
when a due date is moved in a card, for each card linked from an item in checklist "Checklist", move the due date by the same amount of time
Go to the Automation panel, Rule tab, and click on Add (plus sign), the trigger is on the Due date tab, then the first action is on the Content Tab, and to finish the last command is on the Due date tab. Don't forget to save it! :D Als, pay attention to the Checklist name you added, it needs to match with the checklist (on the video example Sub-tasks)
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