If you are using Vegas Pro 11, you can do this. Not on earlier versions.
From the online help (Multicamera Editing – Overview)
Vegas Pro can expand a multicamera track to multiple component tracks.
Select a multicamera track in the track list.
From the Tools menu, choose Multicamera, and then choose Expand to Multiple Tracks from the submenu.
You are prompted to either keep unused takes as muted events or delete them. If you keep unused takes as muted events, you can recreate your multicamera track later. Click Yes to keep unused takes or No to delete them.
Cheers for now,
Tom Pauncz
(30WEST MEDiA GROUP)