@JHendrix Do you mean like duplicating one monitor of another monitor? I press WIN + P to get options to duplicate, extend, PC monitor only, second monitor only.
@JHendrix The only other thing I can think of is to have 2 instances of Vegas running with the same project. Make sure the option is on to have Vegas release locks on files when not the focus. After editing in one instance, save the project, then switch over to the other instance and load the project. With an extended monitor setting, you can drag one of the instances over to the other monitor. You would have to keep going back and forth. I know Windows lets you have more than one desktop, so maybe having an instance in each desktop would make things tidier. Good luck with that.