Grouping and Totals in RDLC Report Viewer in VB.Net

Dear Sir

I'm Trying to Create Multi Grouping row and adding the total of each in report viewer RDLC in VB.NET.

Please Guide Me.

Thanks

Code in FORM1

Imports System.Data.OleDb
Imports Dapper

Public Class Form1
    Private Function CreateConnection() As String
        Return ("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\GROUPROW.accdb;Persist Security Info=False;")
    End Function
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Using db As IDbConnection = New OleDbConnection(CreateConnection)
            If db.State = ConnectionState.Closed Then
                db.Open()
            End If
            'Execute query to get orderdetails and products data
            Dim query As String = "SELECT ITEM,PRICE,QTY,CATEGORY1,CATEGORY2 FROM ITEM"
            Dim list As List(Of ITEM) = db.Query(Of ITEM)(query, commandType:=CommandType.Text).ToList()
            Using frm As New frmPrintPreview(list)
                frm.ShowDialog()
            End Using
        End Using
    End Sub
End Class
Public Class ITEM
    Public Property CATEGORY1() As String
    Public Property CATEGORY2() As String
    Public Property ITEM() As String
    Public Property PRICE() As Integer
    Public Property QTY() As Integer

End Class

code in frmPrintPreview

Imports Microsoft.Reporting.WinForms

Public Class frmPrintPreview
    Private _list As List(Of ITEM)
    Public Sub New(ByVal list As List(Of ITEM))
        InitializeComponent()
        _list = list
    End Sub

    Private Sub frmPrintPreview_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ITEMBindingSource.DataSource = _list
        Me.ReportViewer1.RefreshReport()
        Me.ReportViewer1.SetDisplayMode(Microsoft.Reporting.WinForms.DisplayMode.PrintLayout)
        ReportViewer1.ZoomMode = ZoomMode.Percent
        ReportViewer1.ZoomPercent = 100
    End Sub
End Class

Desired Result

CATEGORY1 CATEGORY2    ITEM   PRICE  QTY
A1          A1-1       1000   12000  10
                  A1-1 TOTAL         10
            A1-2       1001   15000  8
                  A1-2 TOTAL         8
            A1 TOTAL                 18
B2          B2-1       1002   25000  20
                  B2-1 TOTAL         20
            B2-2       1004   30000  25
                       1005   30000  30
                  B2-2 TOTAL         55
            B2 TOTAL                 75
TOTAL                                93