Is there a way to select multiple staffs if I want to move a whole section? It's really slow to do each staff one by one and often make a mistake in the process
No, there isn't, but one trick yu can use to make sure you are pasting the right bits is to change the colour of the section you want to move, and once it's been moved and lined up properly again you just change it back.
Okay That sound like a good idea. And I'll put this on the wish list!