Select works the same way many other programs work. Click on the first note (or chord), then use "ctrl-click" to select individual notes or "shift-click" to select a range.
You can even use search after you select your first note so you can position to a new measure, if you know the measure number. For example, you would click on a note, then press "shift-ctrl-B" to move to a beat or measure, then hold down the shift key while you click the last note in the range you want to copy.
Then press "ctrl-C" to copy to the clip board. Then select the beat you want to paste the notes to (right click on the beat to make it current) then press "ctrl-V" to paste. (You can also just select "copy" and "paste" from the "Edit" menu if you prefer to use the menus.
RdBass4's post in How do i copy a group of notes was marked as the answer