To add new names in a handmade patch:
- if you use 1.68b patch, some brands and names are included in it already
- if not and for other names you have to create them with the updateResource instruction in Patch Editor (TDUMT 1.15):
resourceFileName : CarPhysicsData
resourceValues : 15654545|Model1||1566554|Model2 etc...
where numbers can be chosen freely, but must not exist already. Check in DB Resource editor to know.
Then run this short patch and check if those names are now available in Vehicle Manager (TDUMT 1.15) > Datasheet. If so, assign those new names to your car and see if it works in game.
Let's begin with this. I'll give further instructions if it works well.
Oh, and to add new brands, you'll need another tutorial as it's a a bit more complex...