How to paste pages from one OneDrive PowerPoint to another
Firstly you have to have both PowerPoints in OneDrive – so upload the one you want to paste from.
Then select the PowerPoint you want to copy the slide from
highlight the slide on the left pane and press the keys CTL + INS together.
Press the back key ( top left ) and choose the destination PowerPoint
Choose where you want the slide and press CTL + V