Cascading Drop Down list saved in Table Level (Visual Studio LightSwitch)

Question

Hi...

     i need one help please reply me very Urgent. i am  using visual Studio LightSwitch 2011

I have using 3 Cascading Drop Down List Type, Manufacture and model. I want to save 3 drop down list in Equipment Information table

 This is my Data Model :

 
Type:
Id    Integer
TypeName      String
Manufactures  Manufacture Collection
EquipmentInfo    EquipmentInfo  Collection        

Manufacture:
Id        Integer

ManufatureName  String
Model  Model Collection
EquipmentInfo  EquipmentInfo  Collection 


Model:
Id  Integer
ModelName  String
Manufatures  Manufactures

EquipmentInfo  EquipmentInfo  Collection

EquipmentInfo:

Id  Integer
PlateNo        String
Type  Type
Manufactue  Manufactue
Model  Model