We're using milestones for our workflow to measure "Sprints" of work, and we split them out by Android and iOS for our work. We've created parent/child relationships for our sprints like this.
My only gripe is that the parent sprints don't show all the tasks in the child sprints, or the percentage complete as a whole between all of the child sprints.
I can understand that you might want to be able to add tasks to just the parent sprint, but it would be cool if there was an option to enable parent sprints to show and count all tasks of child sprints.
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