Is it possible to pick a date in a first row that populates all the rows below it programmatically.
So top of column it I select a final due date from 30 days from now and then all the rows below it take their cue from that date (copy due date is 3 weeks before final due date. Editing due date is 2 weeks before. Design is due 1 week before. etc.
I’m not 100% sure I understood your question, but I try this.
Define a Final Due date, in this cas outside of your table
Create your table with a category column, which is a lookup to a Category Table (copy, editing and design) that also has the number a days, as you mentionned (7,14,30)