Urgent please: Master-Deatils OAF Page for enter and Update data

Hi all,
i need your help to build master-details oaf page for Enter / Update data
for example: We have Locations , Department , Employees tables
all these tables on one oaf page (OAAdvancedTable)
when user enter New Location and go to Enter it's Departments and for each department, he can Enter they employees.
and Regarding to Update date:
- when user select Location , Department table fetch all departments and user can update
waiting your support for urgent please
Regards
Hany

i do these Steps :
1- Create LocationEO,DepartmentEO and EmployeesEO
2- Create Association between LocationEO and DepartmentEO with one-to-Many relation (LocToDeptAO)
3- Create Association between DepartmentEO and EmployeesEO with one-to-Many relation (DeptToEmpAO)
4- Create View Object (LocationVO)
5- Create DepartmentVO (and add LocationEO due to LocToDeptAO)
6- Create EmployeesVO (and add DepartmentEO due to DeptToEmpAO)
7- Creare View Link between LocationVO and DepartmentVO (Based On LocToDeptAO) --> LocToDeptVL
8- Creare View Link between DepartmentVO and EmployeesVO (Based On DeptToEmpAO)---> DeptToEmpVL
9- Add LocaionVO to Application Module, then add DepartmentVO Via (LocToDeptVL)
10-Add EmployeesVO to Application Module Via (DeptToEmpVL)
and Then Run Test AM, all data fetch sucessfully, and i can insert data with proper relations
NOw, i want to implement this Business Logic in single oaf Page using 3 OAAdvancedTable (Master - Details -Details )
Regards

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