To copy a track to another track of the same part number, press and hold COPY and select the source track. Now select the destination track. Pressing RECORD initiates the copy.
Copying a tracks between parts
To copy a track of one part to a single track of another, press and hold COPY, select the source track, select the destination part number, select the destination track, then press RECORD.
Copying selected information (notes, pitchbend, individual MIDI channels, etc.)
Use page up and page down buttons to select the desired data while holding the COPY button and choose the data selection you want prior to pushing RECORD is pressed.