CrystalReport Groups techniques

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C#

I am working with crystalReport. Where I want to display the records of a SQL Server based tables. I Design the CrystalReport but not able to design it exactly, how I want.
I Wrote the following code,

SqlConnection con = new SqlConnection(Global.constr);
           con.Open();
           SqlDataAdapter da3 = new SqlDataAdapter("select * from ItemDetails", con);
           DataSet ds3 = new DataSet();
           da3.Fill(ds3, "ItemDetails");
           rptItemnList abc = new rptItemList();
           abc.SetDataSource(ds3.Tables[0]);
           crystalReportViewer1.ReportSource = abc;
           crystalReportViewer1.Refresh();

so, I am getting following output.

BrandName         ItemCode        Price        Stock
-------------------------------------------------------
aaaa              mmmm             77           200
aaaa              nnnn             12           354
aaaa              oooo             35           571
bbbb              iiii             14           34
bbbb              jjjj             71           157              

but I want my report to be look like:

BrandName         ItemCode        Price        Stock
-------------------------------------------------------           
aaaa
                  mmmm             77           200 
                  nnnn             12           354
                  oooo             35           571
                  ------------------------------------
                  total stock                   1125  

bbb               iiii             14           34
                  jjjj             71           157 
                 ------------------------------------
                  total stock                   191    

Please help me. I am not be able to decide the way.