Isolating vocal parts in a song

Does anyone know if there is a way to isolate the vocal parts of a song? I would like to hear the 3 parts of the harmony separately if that is possible. I am using Audacity 2.3.3 on MAC.
Thanks for any advice you may have!

[u]Vocal Reduction and Isolation[/u]. You rarely get “professional” results but it may be useful for what you’re doing.

And of course, you can isolate or delete the left or right channels.

“You can’t un-fry an egg or un-bake a cake and you can’t un-mix a song.”