Un-Merge Audio Files

[Isabella23843776furc]

I accidentally combined two different audio files I uploaded to a project in PremierePro and had made several edits on. 'Undo' or 'CTRL+Z' don't work and instead undo other previous changes. Is there a way to un-merge or un-combine them? It should be possible since they were two different files to begin with.

[Peru Bob]

How did you "combine" them?

Is there a backup or autosave that is prior to your combining them?