title: Group more than one columns in rdlc report with multilevel grouping
body: <p>I have a report where I want to display data obtained by a stored procedure which returns single table.</p>
  <h1>Columns returned from stored procedure</h1>
  <p>Client #, Client Name, Client Phone #</p>
  <p>Project #, Project Description</p>
  <p>Test #, Test Name, Test Description</p>
  <p>Container #, Container Description, Container Parameter</p>
  <h1>Relationship between tables</h1>
  <p>Client  - Project   1-N(one to many)</p>
  <p>Project - Test 1-N(one to many)</p>
  <p>Test - Container 1-N(one to many)</p>
  <h1>Desired format to be displayed</h1>
  <pre>
  Client #  :  XYZ               Client Name : Patterson, Celeste              Phone # (XXX) XXX-XXXX
  
            Project #: P1                    Project Description: Project 1 Data
  
                         Test #      Test Name     Test Description   Container #     Container Description  Container Parameter
  
                            T1            Test 1             Test Data             C1                      Container Data           C1 Parameter
  
                            T1            Test 1             Test Data             C2                      Container 2 Data        C2 Parameter
  
                            T2            Test 2             Test 2 Data          C1                      Container 1 Data        C1 Parameter
  
                            T2            Test 2             Test 2 Data          C3                      Container 3 Data        C3 Parameter
  
            Project #: P2                    Project Description: Project 2 Data
  
                         Test #      Test Name     Test Description   Container #     Container Description  Container Parameter
  
                            T1            Test 1             Test Data             C1                      Container Data           C1 Parameter
  
                            T1            Test 1             Test Data             C2                      Container 2 Data        C2 Parameter
  
                            T2            Test 2             Test 2 Data          C1                      Container 1 Data        C1 Parameter
  
                            T2            Test 2             Test 2 Data          C3                      Container 3 Data        C3 Parameter
  </pre>