gswitz

AT
Or just copy and paste the BV on a new track.

Wouldn't drag and drop work too?

 
Yes. I would just create a new track, add some take lanes, and drag the relevant clips onto it.

Seems too simple. Maybe I've misunderstood the question!

I do this fairly often myself - record a bunch takes in one track then separate them after the fact.   My typical workflow is what was last mentioned - drag them from the source (initial) track to destination track.  Just be sure to hold the Shift key while dragging to retain the clip's position along the timeline.   Since many clips tend to look very similar in my case, I also find it helpful to name the take lanes so I know what each lane originally contains.