1. Make sure that music production software, such as GarageBand, Ableton Live or FL Studio, is installed on your computer. If not, you can find and download one on the Internet.

2. Open a new project in the music production software, and select the number and rhythm of tracks suitable for Parting.

3. add an instrument track, such as piano, to each audio track.

4. In each instrument track, you can start to compose the melody of Parting. You can set the pitch, volume and timbre on each note. If your computer has a MIDI input device (such as a keyboard or MIDI controller), you can play the melody directly on the device and then synchronize these notes in the music production software.

5. When you finish composing melody, you can add extra tracks to create accompaniment and chords.

6. Once you are satisfied with each track, you can mix and export your creation.

This is only one possible method, and you can adjust these steps according to your own preferences and skills.