Describe the class relationships among Product, SubProduct and a Customer(or Lead) in C#

A Product can have multiple SubProducts. And multiple Customers/Leads can subscribe to multiple SubProducts

It is described as under

class NProduct
    {
        public string ProductID { get; set; }
        public List<NSubProduct> SubProducts { get; set; }
    }

    class NSubProduct
    {
        public string NSubProductID { get; set; }       
        public string Color { get; set; }
        public string NSubProductName { get; set; }
        public List<NLead> NLeads { get; set; }
    }

    class NLead
    {
        public string NLeadID { get; set; }        
        public DateTime NCreatedDate { get; set; }
    }

Sample data for population of the above data structure

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {  
               var dataSRC = SourceData();   
        }

        private static NProduct SourceData()
        {
            NProduct objNProduct = new NProduct();
            objNProduct.ProductID = "1";
            objNProduct.SubProducts = GetSubProducts();
            return objNProduct;
        }

        private static List<NSubProduct> GetSubProducts()
        {
            List<NSubProduct> lstSubProds = new List<NSubProduct>();
            Enumerable
                .Range(1, 4)
                .ToList()
                .ForEach(
                            i =>
                                lstSubProds.Add(
                            new NSubProduct
                            {
                                 NSubProductID = "NSubProductID" + i.ToString()
                                 , NSubProductName = "SubProduct" + i.ToString()                                 
                                 , NLeads = GetLeads(i)
                            }));
            return lstSubProds;
        }

        private static List<NLead> GetLeads(int j)
        {
            List<NLead> lstLeads = new List<NLead>();

            for(int i=0;i<5;i++)
            {
                
                
                    lstLeads.Add(
                            new NLead
                            {
                                NLeadID = "NLeadID" + ((i%2==0)?i.ToString() : j.ToString())
                                 ,NCreatedDate = DateTime.Now.AddDays(j)

                            });
                
            }
            return lstLeads;
        }        
    }

    class NProduct
    {
        public string ProductID { get; set; }
        public List<NSubProduct> SubProducts { get; set; }
    }

    class NSubProduct
    {
        public string NSubProductID { get; set; } 
        public string NSubProductName { get; set; }
        public List<NLead> NLeads { get; set; }
    }

    class NLead
    {
        public string NLeadID { get; set; }        
        public DateTime NCreatedDate { get; set; }
    }
}