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There seems to be a lot of clutter with tasks and sub-tasks and how they appear. I've created 6-7 tasks for returns and I have a massive list of tasks in my task list. Short of always going in and selecting the parent tasks in in the filters we see every task and sub task.
More annoying is that when a task is created the parent task stays on everyone's task list until the parent is completed. I feel that a better work flow and less cluttered work flow would have the parent task only show up on whoever the current sub-task is assigned to. This would "pass" the parent task around and only show up on someones task list when it's their turn to complete the sub-task.