Different offset per task name. "Design" → Parent + 3 days, "QA" → Parent + 14 days.
Standardized task names ("Design", "QA", "Review")
3-6 task types
Don't use if task names vary or you have many task types
Go to board → "Automate" → Search "when subitem is created name"
When subitem is created and if the subitem's name is this name
→ then set its date to match parent item date + X Days/Weeks/Months
The name of the task (subitem)
The date column to act on in the subitem
The date column to that will be the refrence date from the parent item
Choose the offset combination: X - amount of timeDays / weeks/ months
When subitem is created and if name is [Design]
→ set [Due Date] to [Project Start] + [3] [Days]
Create "Design" task → Verify Due = Start + 3 days