Hi Maria. Is what you are asking the same as if the due date was the “date of the record creation” + 3 days? The records I’m speaking of are the new records in table B. If so, you could just create a formula field (the due date) in table B with the formula being
DATEADD(CREATED_TIME(), 3, 'days')
Does that work for you?
@Maria_Alvarez So, is it correct to say that 1) you need a due date field in table B and 2) the due date is 3 days after the creation date? If so, see my original answer. Nothing needs be done in an automation.
If I have misunderstood, please clarify for me if you can. Thanks. Good luck!