Add music to the timeline and click this track, and you will find several options on the top of the timeline., such as volume, fade, split, trim, link, duplicate, and delete. You can easily edit your music here. Besides, you can add as many audio tracks as you want and adjust the duration and position by dragging.
About the Link feature:
Click one audio track, then click the Link button, and this audio will be linked to the current image or video scene. When you move this scene, this audio will be automatically moved.