Roextended Project

Hello
I would like to create more cities on ETS2, so I opened ETS2, and "placed" my villages,*
but when i save, he takes the entire map... Including Europe.
How do I proceed to save ONLY my villages and make it an add-on for ETS2?
Thank you for your help...

you need to note the sectors numbers you are interested in and extract those.

Thank you, I’ll try....