How to create same records in parent and chaild entity using Microsoft CRM plugin?

create same records in parent and chaild entity :

At the point when the formation of parent entity then the chaild record consequently planning similar information through plugins.

         Here I will take offer is a parent substance and suboffer is a chaild element.

Create same records In parent and chaild Plugin :

     I however every one of you realize the how to enlist the module enrollment beneath I will give the which activity and message you accomplished for the underneath code. 
Message : Create
Stage   : post_operation



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using System.ServiceModel;

namespace offerdetails
{
    public class offer : IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {
            //Extract the tracing service for use in debugging sandboxed plug-ins.
            ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
            // Obtain the execution context from the service provider.
            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
            // The InputParameters collection contains all the data passed in the message request.
            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity) 
            {
                try
                {
                    // Obtain the target entity from the input parameters.
                    Entity offer = (Entity)context.InputParameters["Target"];
                    Entity suboffer = new Entity("lvt_suboffer");
                    IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                    IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
                    if (offer.Contains("lvt_name"))
                    {
                        //suboffer.Attributes["lvt_name"] = offer.Attributes["lvt_name"];
                        suboffer["lvt_name"] = (string)offer["lvt_name"];
                    }
                    if (offer.Contains("lvt_productid"))
                    {
                       

                        //suboffer.Attributes["lvt_productid"] = suboffer.Attributes["lvt_productid"];
                        suboffer["lvt_productid"] = (Object)offer["lvt_productid"];
                    }
                    if (offer.Contains("lvt_couponcode"))
                    {
                       // suboffer.Attributes["lvt_couponcode"] = suboffer.Attributes["lvt_couponcode"];
                        suboffer["lvt_couponcode"] = (Object)offer["lvt_couponcode"];
                    }
                    if (offer.Contains("lvt_address"))
                    {
                        //suboffer.Attributes["lvt_address"] = suboffer.Attributes["lvt_address"];
                        suboffer["lvt_address"] = (string)offer["lvt_address"];
                    }
                    if (offer.Contains("lvt_email"))
                    {
                        //suboffer.Attributes["lvt_email"] = suboffer.Attributes["lvt_email"];
                        suboffer["lvt_email"] = (string)offer["lvt_email"];

                    }

                    //contact["lvt_employe"] = new EntityReference(employeEntity.LogicalName, employeEntity.Id);
                    Guid subofferid = service.Create(suboffer);


                }
               
                catch (Exception Ex)
                { 
                    throw new InvalidPluginExecutionException(Ex.Message);

                }
            }

        }
    }
}