Automatic subtask status change depending on previous subtask status

[Shee Covarrubias]

I have several projects that we need to have the ability to have a child(subtask) automatically assigned when the preceding child (subtask) is closed/done.  I am unsure how to configure this.  Additionally when the parent (task) is closed I want to be able to configure it so that the next parent(task) is auto assigned and the same with the initial child (subtask)

[Nic Brough -Adaptavist-]

You'll definitely need some coding to do that.  It's not something built into Jira at all.  Sub-tasks are discrete tasks within their parent and have no order or dependency on each other.

I would, as usual, reach for the Script Runner add-on, but there are other scripting and automation add-ons available that might help you.