'How to merge multible datasets in Microsoft SQL server reports builder

I want to Create report to show me main dataset and subs under it ..

EX: Employee table as main table contains his informations. under each employee (each row) more than sub table to show his vacations, benifits. I have data sets called (EmployeeDS,EmployeeVacationDS,EmployeeBenifitsDS,EmployeeCommentsDS) with forign key and last 3 datasets. I hope I could explain it well with out image. how can i do this ?



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