you can unlink you Video from your audio by right mouse clicking on your video & selecting unlink audio & Video
if you only want to affect your Video with cuts and new scenes but want to keep the overall length sync to the audios length, move your Video after unlinking to Video 2 the audio will stay in audio i. After cutting the bits from the original vid drop the new video onto vid 1b ,& move it until happy with the result, mute its audio
I use this method when using 2 cameras on the one subject and want to alternate between the 2. the 2 audios can make it easier to sync the 2 videos by matching the peaks of the audios