Create route in VoyagePlanner from clean chart

I managed to create a route in Voyage Planner, but if I want to create another route (an alternative in case weather, etc), over the same chart, I can't find a way to do so in a clean chart (previously created route remains there and can't be taken out).

Let me be clear, I don't want to remove/delete the prior route, I want to keep the existing routes in my files, but create new ones using a clean chart....

I tried opening another chart, but it also opens with the previously created route on it