[c#] Add multiple items to a list

static class Program
{
    static void Main(string carMake, string carModel, string carColour, string bikeModel, string bikeMake, string bikeColour, string truckMake, string truckModel, string truckColour)
    {
        car Mynewcar = new car();
        motorbike Mynewbike = new motorbike();
        truck Mynewtruck = new truck();

        int choice = 0;
        while (choice != 5)
        {

            Console.WriteLine("MENU");
            Console.WriteLine("What service do you need");
            Console.WriteLine("1. Car");
            Console.WriteLine("2. Motorbike");
            Console.WriteLine("3. Truck");
            Console.WriteLine("4. Search");
            Console.WriteLine("5. Exit");

            choice = int.Parse(Console.ReadLine());

            switch (choice)
            {
                case 1:
                    Console.WriteLine("What is the car make?");
                    Mynewcar.make = Console.ReadLine().ToLower();
                    carMake = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("What is the car model?");
                    Mynewcar.model = Console.ReadLine().ToLower();
                    carModel = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("What is the car Colour?");
                    Mynewcar.colour = Console.ReadLine().ToLower();
                    carColour = Console.ReadLine();
                    Console.WriteLine("");

                    break;
                case 2:
                    Console.WriteLine("what is the motorbike make");
                    Mynewbike.make = Console.ReadLine().ToLower();
                    bikeMake = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("what is the motorbike model");
                    Mynewbike.model = Console.ReadLine().ToLower();
                    bikeModel = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("what is the motorbike colour");
                    Mynewbike.colour = Console.ReadLine().ToLower();
                    bikeColour = Console.ReadLine();
                    Console.WriteLine("");

                    break;
                case 3:
                    Console.WriteLine("what is the trucks make");
                    Mynewtruck.make = Console.ReadLine().ToLower();
                    truckMake = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("what is the trucks model");
                    Mynewtruck.model = Console.ReadLine().ToLower();
                    truckModel = Console.ReadLine();
                    Console.WriteLine("");

                    Console.WriteLine("what is the trucks colour");
                    Mynewtruck.colour = Console.ReadLine().ToLower();
                    truckColour = Console.ReadLine();
                    Console.WriteLine("");

                    break;
                case 4:
                    string searchchoice = "";
                    Console.WriteLine("select Car, Motobike or truck to search?");
                    searchchoice = Console.ReadLine().ToLower();
                    if (searchchoice.Equals("car"))
                    {
                        Console.WriteLine("Car in inventory: {0} - {1} - {2}", carMake, carModel, carColour);
                    }
                    else if (searchchoice.Equals("motorbike"))
                    {
                        Console.WriteLine("Motorbike in inventory: {0} - {1} - {2}", bikeMake, bikeModel, bikeColour);
                    }
                    else
                    {
                        Console.WriteLine("Trucks in inventory: {0} - {1} - {2}", truckMake, truckModel, truckColour);
                    }
                    Console.ReadLine();
                    break;
                case 5:
                    break;
                default:
                    Console.WriteLine("Sorry, invalid selection");
                    break;
            }
        }
    }

    class car
    {
        public string make { get; set; }
        public string model { get; set; }
        public string colour { get; set; }

        public List<String> carList(car Mynewcar)
        {
            List<String> caradd = new List<String>();
            caradd.Add(Mynewcar.make);
            string carMake = Mynewcar.make;

            caradd.Add(Mynewcar.model);
            string carModel = Mynewcar.model;

            caradd.Add(Mynewcar.colour);
            string carColour = Mynewcar.model;


            return caradd;
        }

    }
    class motorbike : car
    {
        public List<String> bikeList(motorbike Mynewbike)
        {
            List<String> bikeadd = new List<String>();
            bikeadd.Add(Mynewbike.model);
            string bikeModel = Mynewbike.model;

            bikeadd.Add(Mynewbike.make);
            string bikeMake = Mynewbike.make;

            bikeadd.Add(Mynewbike.colour);
            string bikeColour = Mynewbike.colour;

            return bikeadd;
        }
    }
    class truck : car
    {
        public List<String> truckList(truck Mynewtruck)
        {
            List<String> truckadd = new List<String>();
            truckadd.Add(Mynewtruck.make);
            string truckMake = Mynewtruck.make;

            truckadd.Add(Mynewtruck.model);
            string truckModel = Mynewtruck.model;

            truckadd.Add(Mynewtruck.colour);
            string truckColour = Mynewtruck.colour;

            return truckadd;
        }
    }
}

I was just wondering whether anyone could have a look through my code to see which areas I can improve on.

Also I am struggling to add more than one item to the lists for car, bike and truck. How would you do it so you can add multiple instances of the properties and list them to the console?

Thanks to AddRange:

Example:

public class Person
{ 
    private string Name;
    private string FirstName;

    public Person(string name, string firstname) => (Name, FirstName) = (name, firstname);
}

To add multiple Person to a List<>:

List<Person> listofPersons = new List<Person>();
listofPersons.AddRange(new List<Person>
{
    new Person("John1", "Doe" ),
    new Person("John2", "Doe" ),
    new Person("John3", "Doe" ),
 });

Another useful way is with Concat.
More information in the official documentation.

List<string> first = new List<string> { "One", "Two", "Three" };
List<string> second = new List<string>() { "Four", "Five" };
first.Concat(second);

The output will be.

One
Two
Three
Four
Five

And there is another similar answer.