Let's take the following situation:
What happens then is that whatever estimates they have set on the subtasks get added, not substracted, to the parent issue.
At that point when someone will open the parent issue they will see a mess (such as 2x the original estimate),
What is the best way to handle this situation?
I would have both the original estimates and tracked time on the sub-task level or the parent-level - not both.
When you check Include subtasks it pulls both the estimates and time entered from the sub-task layer and summaries it up to the parent.
But this does not replace the ability to separately track time at the story-level. If you enter the Original Estimate at story-level, you also need to track Time Spent here. You can't (for example) have the Original Estimate on the story-level impacted by the Time Spent from the sub-task level.
With this in mind, if you are going to estimate sub-tasks I would avoid setting the time estimates at story-level.
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