Deleting Summary Time Periods
When you remove a summary time period from the hierarchy, its children are moved into another summary time period:
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If you delete the first summary time period, children are moved into the next sibling of the summary time period.
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If you delete the last summary time period, children are moved into the previous sibling of the summary time period.
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If you delete a summary time period from the middle of a hierarchy, children are moved into the previous sibling of the summary time period.
To delete summary time periods: