You use the "copy" and "paste" functions after selecting a parent task and its subtasks. You see that the subtasks are copied twice (once as subtasks below the parent task, once as main tasks):
SAP Portfolio and Project Management (PPM)
SAP Portfolio and Project Management 5.0 ; SAP Portfolio and Project Management 6.0 ; SAP Portfolio and Project Management 6.1
Copy/Paste, Copy&Paste, Multiselect, Multiple Selection, Subtask, Summary task , KBA , PPM-PRO , Project Management , How To
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