splitting the audio beneath a video

I have some video clips that are several minutes in length. Can I split the audio music track beneath this video? (I want to extend the music by cutting in some loops.) So far I cannot position the playhead anywhere on the timeline except at the start or end of the video clip. I tried disabling link to slides and locked timing. v. 4.5.2

at the moment splitting audio doesn’t work yet. we’ll add this in the future though.