Action to delete Parent, children and grandchildren

I have and app that has a parent ORDERS table, that has 4 Chidlren tables and one of those child tables has 3 grandchildren. All three of the have IsPartOf selected. None of the others do.

Only the Some of my users have been entering “practice” orders so I would like to be able to delete the order and all it’s children and grandchildren. I’d like to create an action that does it for me but I am not sure how to go about it. I am sure I’m not the first person to need this so I am looking for some guidance

I think I may have found a starting point: I will revert later if I still need help