‘I’ve added this modified video tracks as childs of a primary track. that way, I can edit video in the primary track without the modifications of the other tracks influence my work.’
I’m not sure whether I understand whatyou are doing. But if I understand your question well, I would say that you can simply add a new track (In Vegas Pro you have an unlimited number of tracks) or you start a new project and import the intro into the new project as a nested file
Theo