From the manual:
"Blobs in the editing area can be selected using all the standard techniques: clicking, [Shift]-clicking,
marquee/lasso/rubber-band selection, etc. In addition, the edit menu offers a sub-menu with a variety
of selection commands. To make a selection, use one of the following techniques:
Standard techniques such as clicking, [Shift]-clicking and lassoing to select and deselect notes
[Shift]-click and then drag the mouse to enter Snake Selection mode
Select notes by clicking or dragging in the pitch ruler; double-clicking selects notes with the
same name in all octaves rather than simply at the pitch clicked
In the pitch ruler also, you can [Shift]-click or [Shift]-drag to add or remove notes from the
selection
In the Edit menu, you will find the usual Select All command but also a sub-menu with special
selection commands
Melodyne allows you to cut, copy and paste blobs. If prior to pasting a blob (the ‘source’ blob) you
select another (the ‘target’ blob), when you paste, the former will replace the latter. If no blob is
selected at the time of pasting, the source blob will be pasted at the cursor position. If, however, the
blob was offset from the grid prior to copying, it will be offset from the playback cursor after pasting
and by the same amount; if you want the insert point and the cursor position to coincide exactly, set
the time grid to Seconds prior to pasting."