//Object 1
<?php
class ProductSubCategory extends DataObject {
   
   static $db = array(
      'Name' => 'Text',
      'Description' => 'Text',
      'RemoteIndexId'=>'varchar',
      'LegalName' => 'Text',
      'CodeName' => 'Text'
);
static $many_many = array('Ingredients'=>'Ingredient');

function addIngredients($ingredientsArray){

   foreach($ingredientsArray as $k=>$value){
         $newIngredient = new Ingredient();
         $newIngredient->RemoteIndexId = $value->id;
         $newIngredient->Name = $value->name;
         $newIngredient->CodeName = $value->code_name;
         $newIngredient->Description = $value->description;                  
         $this->Ingredients()->add($newIngredient);
      }
   }

}
//Object 2
<?php
class Ingredient extends DataObject {
   static $db = array(
      'Name' => 'Text',
      'RemoteIndexId'=>'Varchar',
      'ScientificName' => 'Text',
      'Description'=>'Text',
      'Percentage'=>'Varchar',
      'CodeName'=>'Varchar'
   );

   static $belong_many_many = array('ProductSubCategory' => 'ProductSubCategory');