Is it possible to make a 'Select List (multiple choices)' field that a user can interact with but is also controlled by a script? For example, I want a parent issue to "inherit" the selections of a field of its children if it has any, but if it does not, then allow the user be able to edit the field as normal.
I looked at Behaviors, but those appear to apply only on "Screens". I have a constraint that I also want this field to be "live" in Structure, where there is no such "Screen" on which the Behavior would apply.
Is this possible?
Thanks,
David