Right click on content in the timeline you want to edit. In the menu find “unlink.” Now click in another area so that you deselect the timeline. Go back to the time line you want to edit and do your cuts. You will note that only the video or audio where you place the mouse arrow will be sliced instead of the video and audio being sliced together.
Expermient and you will realize the function you are looking for. Good luck. S4N