Use Copy and Paste. Start by selecting the notes you want to copy. You can select notes by using the 'select notes' tool in the Pianoroll. Draw around the notes you want. At the bottom you see now that the page has switched to 'Copy / Paste':
Choose which events you want to copy and to which buffer. Press 'Copy selected events' and then 'Paste copied events'. A dialog box will show. Here you can select which track to paste into, at which time (Bar, Beat, Tick), how the pasted events should treat old events, if notes should be transposed, and finally, how many times you want the events to be pasted.