Final Cut Pro X — Connect audio clip to another audio (not video)

Question

I have a simple video with some background noises added and a background audio track.
However, background audio track is too long, so I carefully cut it into multiple pieces and seamlessly mix:

It works fine, but my second audio part is now connected to the video on top — every next change in the timeline will break my carefully mixed audiotracks.
I want it to be connected to the first audio part instead.
Is it possible?

Answer 1

Create a compound clip with the music on the audio track. This will fix them in place. Replace the individual clips with the compound clip.