Synching multicam long clip with numerous short clips

I shot an interview with a master shot that is one continuous take. Let's call it 10 minutes. And a friend was filming for fun, shooting short clips of the interview that are 10 to 30 second long shots. They shot dozens of clips that I would like to synch to my master 10 minute clip, but I do not know the process for this.

When I select them all, the synchronize option is unavailable.

Any suggestions?