+1 to Bristol.
IMO it's absolutely unnecessary and unpractical to do destructive clip editing for volume in order to get track volume adjusted on particular sections.
And what if you need progressive curves? Up and down...you'd need to split dozens of times.
Automation is the way to go, no doubt. It's faster as well. You can just let the music play and move the slider, and then move individual nodes to adjust the details. Or, if there are just a couple of places where adjusting is needed, you create an envelope, add the necessary nodes and set them corrcectly.