Let's say I have a route A-B-C-B-A. I need to change it to A-B-A. Is it no way except creating a new one? Will I loose all my route image earned on the previous route?
YES, you have to delete the route and re-create it. NO you will not lose route image.
TIP: You will be arriving at the destination an hour or more earlier (or leaving base an hour later). Rather than buy new slots, recreate the route with an extra hour of turnaround at the destination to make sure you pick up all the slots you already own and then modify it to the actual times you need.
Thank you.