how to copy parent custom filed(user picker) to special type sub

[Виктория]

how to copy parent custom filed(user picker) to special type sub.
when the value change in parent custom field(consultant) I need to set this value to assignee of specific type of subs(sub-consultant)
and same for another one - developer -> sub-development.
help me with code in behaviours, (script runner), please

[Gaurav]

Hello @Виктория 

If I understand correctly, you want to update the assignee of a sub-issue type when the value of a custom field in Parent Issue is changed/ updated.

This is possible using Automation as well. Please let me know if this is something you would be interested in exploring. I can help you with that.