You can copy the workshop folder of the modded cars into the games StreamingAssets folder and rename them there (as the workshop cars holds cryptic numbers as alias folder names).

Just go to the hdd you installed Car Mechanic Simulator 2018 to and search for the workshop folder with the number 645630. There are your workshops mods. Don't get upset of the many folders because even if you do not download a specific mod, steam makes already an empty folder for it. Then copy the folders in question to the cms2018 folder "Cars" found under /Car Mechanic Simulator 2018/cms2018_Data/StreamingAssets/

After that open this folder and look for the original names of the mods. In every modded car folder there is a file starting with "car_" and ends with ".cms"

For example the 1993 Ford Mustang by deadbob777 can be found under the folder "1203729435" and the file you need for getting the right name is "car_fordmustang93-deadbob777.cms". So just copy that name without the "car_" and ".cms" like "fordmustang93-deadbob777" and paste it renaming the folder name.

THANK YOU! In some instances I will not have internet and want to use car mods. I have been going crazy trying to figure out how to do this lol.

I think I should warn you, that offline workshop cars may not have any body parts available in the import goods shop. So in your "offline" time you should not take custom orders for modded cars, which includes body work.

I usually am just doing restoration atm since I ranked up=) The only thing I noticed is on one of my 2013 mustangs the liveries dont show up offline and car reverts to all white paint then when I log back online they show back up lol but only small disadvantage. Thanks for heads up though.