question

@PlaystationGamer-8084, Welcome to Microsoft Q&A, I would recommend that you use dictionary to store the menu options and use list to save the choose options.

Here is a code example you could refer to.

    static void Main(string[] args)
         {
             string[] AddionalExtras = new[] { "1 -  Alloys", "2 - Privacy Glass", "3 - Spare Wheel", "4 - Parking Pack", "5 - SYNC 3 with Navigation", "6 - Winter Pack", "7 - Floor mats", "8 - Boot liner", "9 - Dashboard camera", "10 - Pet travel mat" }; // Any additional extras will be displayed in the array
             Console.WriteLine(String.Join(Environment.NewLine, AddionalExtras)); // All of the extras are displayed from the array, line by line
             List<string> list = new List<string>();
             Dictionary<int,string> dic=new Dictionary<int, string>();
             foreach (string item in AddionalExtras)
             {
                 int n =Convert.ToInt32(item.Split('-')[0].Trim());
                 string m = item.Split('-')[1].Trim();
                 dic.Add(n, m);
             }
             while (true)
             {
                 Console.WriteLine("Please select any of the extras that you would like to purchase!");
                   
                 int ExtraSelection = Convert.ToInt32(Console.ReadLine());
            
                 if (dic.ContainsKey(ExtraSelection))
                 {
                     list.Add(dic[ExtraSelection]);
                 }
                 else
                 {
                     Console.WriteLine("Please input the correct number");
                 }
                 ConsoleKeyInfo c = Console.ReadKey();
                 if (c.Key == ConsoleKey.Spacebar)
                 {
                     break;
                 }
    
             }
             Console.WriteLine("The next is your purchase list");
             foreach (var item in list)
             {
                 Console.WriteLine(item);
             }
             Console.ReadKey();
         }

Note: If you want to end the choose, Please click O in the console otherwise click enter to continue to purchase something.

Result:

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