[HttpPost]
    public ActionResult Create(int recipeID, RecipeStep newRecipeStep)
    {
        try
        {
            var recipe = db.Recipes.Single(r => r.recipeID == recipeID);
            recipe.RecipieSteps.Add(newRecipeStep);
            db.SaveChanges();
            return RedirectToAction("Index", "Recipe");
        }
        catch
        {
            return View();
        }
    }

public class RecipeViewModel
    {
       public int RecipeId { get; set; }
       public RecipeStep RecipeStep { get; set; }
    }

public ActionResult Create()
    {
        var recipeId = 10 // however you want to select that Id

        var recipeViewModel = new RecipeViewModel {RecipeId = 10}

        return View(recipeViewModel);
    }

  [HttpPost]
  public ActionResult Create(int recipeID, RecipeStep newRecipeStep)
  {
     //your code
  }

@model MvcApplication3.Models.RecipeViewModel

@using (Html.BeginForm(null,null,FormMethod.Post))
{

 <div>
    <p>@Html.HiddenFor(x=>x.RecipeId) </p>
    <p>@Html.TextBox("RecipeStepData1")</p>
     <p>@Html.TextBox("RecipeStepData2")</p>
    <p>@Html.TextBox("RecipeStepData3")</p>
</div>
<input type="submit" value="Submit"  id="btn" />
}