This idea has been merged into another idea. To comment or vote on this idea, please visit A-I-9744 Automation actions to have 'same as' to copy field values.
For example, if a release is assigned to someone as the owner, I would like a rule that updates all the related features - to assign them to the same person.
Same idea, I created a fairly large roadmap, took the defaults and now support tells me I have to manually update everything. It would be really handy to update the top level and click to update all the sub tasks.