300 layers are not enough at all. And if I want to apply the same picture on different vehicles, I have to repeat it many times, which is very inhumane.
I agree that making a logo several times is a severe punishment on creative people, and even worse for people who struggle to get it right. Definitely inhumane. I think once you have made one good logo, that should be compressed into a shape that you can then reuse.
I have made more than 50 liveries, and I have spent a lot of effort on them. So I sincerely hope that my suggestion can be adopted. Attach some liveries I made.
Personally, i would just like a simple "Save Layer(s)" icon and a southern Logo for the 377's or a DB logo on German Trains Or SE on SEHS Trains or BR on all Trains
No, you can't. The best you can do is duplicate a livery (for the same vehicle, only) and then delete everything else.