With the sub cards functionality you can create cards under a parent card to subdivide your tasks of longer work into smaller tasks. If you don't want sub cards to be planned later than the parent card, you can set up an automation.
When the date of a sub card is changed, change the planned date of the parent card
This automation has a fixed operation. You cannot set your own conditions. Once you click Add and save your planboard it is on.
If you now plan a sub card later than the parent card, then the planned date of the parent card adjusts.
