Inheriting to the Employee entity class

Question

Hello all!

I need help, by using C#, SQL Server and entity framework I should make the following task:

 "By inheriting the Employee entity class create a class which allows employees to access their corresponding territories as property of type EntitySet<T>.".

Actually I don't have idea from where I should start. Here is diagram of database http://merc.tv/img/fig/Northwind_diagram.jpg . 

Thanks in advance!