I have a very specific work process where this would be incredibly helpful. It's when a team member needs to alerted that a subtask, assigned to another team member, is moving through the pipeline.

These upvotes should be combined with those on the following feature request:

I urgently need this functionality. It will super help with productivity and with the response we need for the workflow. You will be able to reduce a lot of follow-up time on this and be able to focus on what really matters.

PLEASE add this functionality!

this would be an ideal feature..its been 3 years now :-)

Any update for this feature?

Any ability to control/influence the parent ticket from a subtask would be very helpful.

an we please get this feature asap?

This would be a great addition to the feature set, would help visualize project planning.

I would ad that every time something happns in Subtask a Comment is left on Parent Task, or the possibility to create the Automation.