Hierarchy in WEBI

Hi team

I have created a universe based on the SQL table from SQL 2005 server.

Now I have also created webi on top of that universe.

But now my problem is i want to create an hierarchy from three fields from SQL table..how can i achive it?

Three fields

1) Sales Manager

2)Sales Leader

3) Sales employees

NOw in the webi i want to see this data in hierarchy fasion.? How can this be achieved

Please provide some hints

Thanks

Pallavi