Apologies for the misunderstanding.
What I do, and it's hardly overly technical spo maybe there is a more 'official' method out there, is to drag and drop the video and the audio to the timeline.
Stretch the audo vertically in the timeloine so I can see the waveform. Find a suitable audio 'cue' that is matchable in the video (a single clap maybe?) and then move the audio to line up with the video. I find this much easier when I can see the waveform. Sometimes it's convenient to line up equivalent waveforms from that on the video itself.
once lined up, unsync the original audio track with the video and remove it. Then 'join' the new one with the video so that they move together.
I appreciate this is more awkward as an event videographer. I make 'movies' and I fast learned to appreciate what a clapper board is for