diff --git a/app/controllers/items_controller.rb b/app/controllers/items_controller.rb
index f5c0323..66405aa 100644
--- a/app/controllers/items_controller.rb
+++ b/app/controllers/items_controller.rb
@@ -1,5 +1,6 @@
 class ItemsController < ApplicationController
   active_scaffold :"item" do |conf|
     conf.columns[:unit].form_ui = :select
+    conf.columns[:sub_category].form_ui = :select
   end
 end
diff --git a/app/models/item.rb b/app/models/item.rb
index 50be2e1..ac61ae3 100644
--- a/app/models/item.rb
+++ b/app/models/item.rb
@@ -1,6 +1,7 @@
 class Item < ActiveRecord::Base
   belongs_to :unit
   has_many :multi_media_descriptions
+  belongs_to :sub_category
 
-  validates_presence_of :name, :description, :list_price, :current_input_price, :tags, :unit_id, :code
+  validates_presence_of :name, :description, :list_price, :current_input_price, :tags, :unit_id, :code, :sub_category_id
 end
diff --git a/app/models/multi_media_description.rb b/app/models/multi_media_description.rb
index 57f7a26..7153287 100644
--- a/app/models/multi_media_description.rb
+++ b/app/models/multi_media_description.rb
@@ -1,5 +1,4 @@
 class MultiMediaDescription < ActiveRecord::Base
   belongs_to :item
   belongs_to :media_type
-
 end
diff --git a/app/models/sub_category.rb b/app/models/sub_category.rb
index 70f8332..c855ae3 100644
--- a/app/models/sub_category.rb
+++ b/app/models/sub_category.rb
@@ -1,3 +1,5 @@
 class SubCategory < ActiveRecord::Base
   belongs_to :category
+  has_many :items
+  belongs_to :sub_category
 end