How to copy, paste orchestral score

Same process regardless of how many staves are involved: select what you want to copy, Ctrl+C, click where you want to paste, Ctrl+V. There are many ways of doing a selection, but a common one is to click the top left note then shift-click the bottom right note of the region you want to select. Or click the first note in the top staff, Shift+Down until you have as many staves as you want, then Shift+Right or Shift+Ctrl+Right until you have as many notes/measures are you want. Shift+Drag works too. These are all the same ways you'd select from a single staff too.