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My model have a property list and this property has another inside.
I made changes to this properties list before make submit but many properties hasn't values, they lost.

Main Model with lists

public class PedidosViewModel : BaseFormViewModel<long>

//Main properties here

public List<PedidosDetalleViewModel> PedidosDetalle get; set; 


public class PedidosDetalleViewModel

 public long Id get; set; 
 public long IdPedido get; set; 
 public long IdEstiloCombinacion get; set; 
 public string Combinacion get; set; 
 public string Descripcion get; set; 
 [Required]
 [RegularExpression(@"^[0-9]*$", ErrorMessage = "La Cantidad debe ser numérico entero")]
 public int CantidadPares get; set; = 0;
 public decimal Precio get; set; 
 public decimal PrecioMoneda get; set; 
 public decimal Importe get; set; 
 public decimal ImporteMoneda get; set; 
 public int Estatus get; set; 
 public string EstatusStr get; set; 
 public List<PedidosDetalleCorridaViewModel> PedidosDetalleCorrida get; set; 


public class PedidosDetalleCorridaViewModel

 public long Id get; set; 
 public long IdPedidoDetalle get; set; 
 [StringLength(20)]
 public string Punto get; set; 
 [StringLength(20)]
 public string Valor get; set; 
 [RegularExpression(@"^[0-9]*$", ErrorMessage = "La Cantidad debe ser numérico entero")]
 public int CantidadPares get; set; = 0;

In the partial view with the list details i have:

@ int rowNum = 0; 
 @for (int j = 0; j < Model.PedidosDetalle.Count(); j++)
 
 <tr>
 <td>
 @(rowNum += 1)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Id)
 @Html.HiddenFor(m => m.PedidosDetalle[j].IdEstiloCombinacion)
 @Html.HiddenFor(m => m.PedidosDetalle[j].IdPedido)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Combinacion)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Descripcion)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Precio)
 @Html.HiddenFor(m => m.PedidosDetalle[j].PrecioMoneda)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Importe)
 @Html.HiddenFor(m => m.PedidosDetalle[j].ImporteMoneda)
 @Html.HiddenFor(m => m.PedidosDetalle[j].Estatus)
 @Html.HiddenFor(m => m.PedidosDetalle[j].EstatusStr)
 @Html.HiddenFor(m => m.PedidosDetalle[j].CantidadPares)
 @for (int i = 0; i < Model.PedidosDetalle[j].PedidosDetalleCorrida.Count(); i++)
 
 @Html.HiddenFor(m => m.PedidosDetalle[j].PedidosDetalleCorrida[i].Id)
 @Html.HiddenFor(m => m.PedidosDetalle[j].PedidosDetalleCorrida[i].IdPedidoDetalle)
 @Html.HiddenFor(m => m.PedidosDetalle[j].PedidosDetalleCorrida[i].Punto)
 @Html.HiddenFor(m => m.PedidosDetalle[j].PedidosDetalleCorrida[i].Valor)
 @Html.HiddenFor(m => m.PedidosDetalle[j].PedidosDetalleCorrida[i].CantidadPares)
 
 </td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].Combinacion)</td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].Descripcion)</td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].CantidadPares)</td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].PrecioMoneda)</td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].ImporteMoneda)</td>
 <td>@Html.DisplayFor(m => m.PedidosDetalle[j].EstatusStr)</td>
 <td>
 <a class="btn btn-md btn-primary" onclick="CargarDetalle(@Model.PedidosDetalle[j].Id)" href="javascript:void(0);"><i class="fa fa-pencil"></i> Editar</a>
 </td>
 <td>
 <a onclick="EliminarPedidoDetalle(@Model.PedidosDetalle[j].Id)" href="javascript:void(0);"><i class="glyphicon glyphicon-remove-sign icons-app icons-md icons-app-danger"></i></a>
 </td>
 </tr>
 

as you can see many hidden controls just for keep the values when i postback, but properties like Id, Importe, Estatus lost their values. I am thinking to use session (because .net MVC don't have viewstates) for save temporary my detail list with all values and edit values list if i need just before save changes.
I use javascript for load the partial view with an ajax call for pass all the form serialized every time i add new record in the list.
There is a solution with MVC, Ajax and mainting the values in my main model.

This is the screen:
enter image description here