Open audio-editing software.
Click "File" from the file menu at the top of the interface and click "Open." This will allow you to search for the partial music file you wish to burn.
Highlight the partial music file you wish to burn and click "Open." This will open the file as a waveform in the sound-editing interface, which can be edited as a time line.
Click and drag to highlight the portion of the music file you wish to burn.
Click "File" and select "Export Selection as MP3." This will open a "Save File As" dialog box.
Select the location to where you wish to save the partial music file and click "Save."
Insert a blank CD into your disc-burning drive.
Drag the partial music file to the disc-burning drive and follow the steps to burn the partial music file to disc.