when deleting a work log from a child issue, it would be possible to also delete it from its parent issue by using Jira automation rule
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Worklogs exist on single issues, the ones on sub-tasks do not belong to the parent issue, and there's no copy.
What the parent issues are doing are calculating estimate and worklog "sum of sub-tasks" when you have the "include sub-tasks" in their display, or look at the Σ fields.
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