Create Employee Hierarchy Using Trace Tree?

I am looking to create an employee hierarchy in a trace tree and have 2 specific fields in my table ( employee , reports to )

Now a sample data looks like follows

Employee Reports to
User A Manager A
Manager A Senior manager A
User B Senior Manager A
User C Manager A

so on and so forth

Now how do I get a trace tree so that when i click on Senior manager A I get Manager A and User B , and then expand manager A to get user A and User C.