Is this an ADF related question? I dont think so.!!!
However you may need to prime your entity relationship skills with database structure.
if Employee tables has primarykey employee id; if employment table ideally should have a relationship with employees say; employeerefId is a foreign key.
That set, you simply create an association between employeeEO and employmentEO entity objects; and a subsequence viewlink based on the FKAssociation.
A master detail relationship in your ApplicationModule for both viewobjects; where EmployeeVO is master and EmploymentVO is detail.
Ideally you would want to create the employments viewobject as a table on your jsf page or whatever suits your usecase