Exclude Slides from Scene.Progress Variable

Hi Everyone, 

Is it possible, or has anyone had any luck with, excluding slides from the Scene.Progress variable? I am using the variable in scene two of a project, but within that scene I lightbox to some other slides in scene one. When this happens, it throws the progress % off. I just want the scene.progress to account for slides specifically in scene two. I hope that makes sense! And, thanks for the guidance! -Amy