Add music to the timeline and click this track, and you will find several options in the toolbar above, such as Volume, Fade, AI, Split, Trim, Link, Duplicate, and Delete.
Besides, you can add as many audio tracks as you want and adjust the duration and position just 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.