Sum the value of sub-task based on main task information

Hi Guillaume,

Sorry for the wait for the reply!
The idea here is that you would need to inherit the country custom field value from the Parent issue to the sub-tasks. Here are couple of examples how to do it with Javascript calculated custom field:

Note that you would use the following parameter for inheriting from standard Parent hierarchy: update_from_issue_key = "subtask_parent_key"

Please let me know if you have further questions regarding this!
Lauma / support@eazybi.com