If you need to make edits to your audio without affecting the associated video or adjust the timing of your video to make sure that it is synced up with the audio, Detach Audio is for you.
How to detach audio
Simply right-click on the video in either the timeline or in the Project Sidebar, and select Detach audio. Descript will turn your video clip into a multitrack sequence with the video and audio on separate tracks - you can then open the Sequence Editor to edit and make adjustments to either the audio or video.