Labels don't stay with marked sections of track

Sorry if this is stupid and I don’t understand how labels are supposed to work but…I’m editing a podcast that was initially recorded all as one track. But I now want to go in and add some additional audio that I recorded separately. I used labels to identify the sections of the original track (e.g. who is speaking about what topic) so I’d easily be able to see where to paste in the extra bits. But when I add some new audio in, the label doesn’t seem ‘attached’ the labelled audio, rather to the timestamp on the track, so adding anything new throws all the labels off and I don’t know where anything is anymore.
Is there a way of making the labels permanently attached to that section of audio so if you edit around them, they are still attached to that section??

You can Sync-Lock tracks together so they follow each other.