I learned by myself, (i can't explain here in the coment) so just chill and search for a tutorial or ask for chat GPT
When you're exporting multiple trims into a single model lineup in BeamNG, remove the trim name from both the Car Name and Mod Name. Ensure Zip-Pack Mod is unchecked, then export each trim. So for example if you have: Model: Mustang Trim: Ecoboost Model: Mustang Trim: GT Model: Mustang Trim: Dark Horse Export each trim as Mustang... and you will see all 3 trims under one model. Have fun! info from: Manic Gaming Guy
Example move all the "A1234" (Per exemple) like A1234.pc A1234.png and another sutff with "A1234" in the name. If the car have another engine you put eng_EX34 in the another car files. You should (I'm afirmating) put the blends and the folder of the engine sound (You can edit blends if u want). NOTE: Guys i'm posting mods at the mods section i didn't abandoned beamNG foruns.
very cool car, needs a lot of improvements tho. i can help for a v2 if you need also you have some props inconsistencies on some configs