automate plugin over part of a project

[Ryan Sheeler]

Is if possible to automate the use of a plugin over part of a project?    Example:   I'm using Wave OVox Vocal Synth plugin in Cakewalk.  And I have a song where I'd like to add vocal harmonies to the chorus *only*.   What's the best way to do that.    Can I automate the plugin to just apply to the chorus?  I have it delineated with markers.   Would I be better off cloning the chorus to a separate track and then apply the plugin that way?