Self-referencing model MVC 4 - asp.net-mvc

Question

I have a component that have a list of subcomponents:
public class Componente
{
public virtual int ComponentId { get; set; }
public virtual string NameComp { get; set; }
public virtual List<Subcomponent> Subcomponents { get; set; }
}
public class Subcomponent
{
public virtual int SubcomponentId { get; set; }
public virtual int ParentId { get; set; }
public virtual string NameSub { get; set; }
public virtual Component CompSub { get; set; }
public virtual List<Subcomponent> Children { get; set; }
}
Then i have a view that shows the components, their subcomponents and in the future the subsubcomponents and so on.
<table>
...
if (item.Subcomponents.Count != 0)
{
foreach (var x in item.Subcomponents)
{
<tr>
<td>
#Html.DisplayFor(modelItem => x.NameSub)
</td>
<td>
#Html.ActionLink("Create Subcomponent", "CreateMoreSubcomponents", "Subcomponent", new { id = x.SubcomponentId }, null)
</td>
</tr>
}
}
}
</table>
And the create method:
public ActionResult CreateMoreSubcomponents(int id)
{
var x = db.Subcomponents.FirstOrDefault(e => e.SubcomponentId == id);
if (x == null)
{
return HttpNotFound();
}
var subcomponent = new Subcomponent()
{
ParentId = x.SubcomponentId
};
return View("CreateMoreSubcomponents", subcomponent);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult CreateMoreSubcomponents(Subcomponent subcomponent)
{
if (ModelState.IsValid)
{
db.Subcomponents.Add(subcomponent);
db.SaveChanges();
...
}
The goal is to have subsubcomponents, subsubsubcomponents and so on. But the code that i show here is not working, it gives an error in the db.SaveChanges(); because it asks for the componentId but i don't know what do i have to change. What do i need to change or do? Thanks