How to access value of child table attribute in an actionchain

Summary:

How to access value of child table attribute in an actionchain

Content (required):

I have a table based on emp BO, in which deptno, deptname from dept BO and empno and empname from emp BO by using template in table. Now added a hyperlink in table as a column and enable hyperlink Click Event. Now i have to get values of selected row when click on the hyperlink.

As EMP BO is the main source of the table so I used "$variables.current.row.empNo" to get the value. How to get deptno and deptname in actionChain using