WBS Gantt-Chart does not save Duration value, but the value equals "End Date" minus "Start Date". In order to realize your request, "End Date" has to equal "Start Date" plus "Original Estimate" instead. To do so within WBS Gantt-Chart, you have to use "Schedule Job" function with Java knowledge. https://rssupport.atlassian.net/wiki/display/WGCE0803/Schedule+Settings
As mentioned above, it is difficult to implement. Please compare the outcome and the complexity, then consider if it is right choice.
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