Merge similar cells in column and adjacent columns

Hello everyone
I have a code that merge similar cells in column

Sub Merge_Similar_Cells()
    Dim WorkRng As Range
    Dim Rng As Range
    Dim xRows As Integer
    Dim I As Integer
    Dim J As Integer


    Application.ScreenUpdating = False
    Application.DisplayAlerts = False
        Set WorkRng = Range("A2:A" & Cells(Rows.Count, 1).End(xlUp).Row)
    
        xRows = WorkRng.Rows.Count
        For Each Rng In WorkRng.Columns
            For I = 1 To xRows - 1
                For J = I + 1 To xRows
                    If Rng.Cells(I, 1).Value <> Rng.Cells(J, 1).Value Then
                        Exit For
                    End If
                Next J
                WorkRng.Parent.Range(Rng.Cells(I, 1), Rng.Cells(J - 1, 1)).Merge
                
                I = J - 1
            Next I
        Next Rng
    Application.DisplayAlerts = True
    Application.ScreenUpdating = True
End Sub

I need to merge two more adjacent columns but depending on the similar values in first column
The Columns A / B / C are the main data and I have put the expected output (desired results) in Columns F / G / H (Just for clarify the issue)
But I need the working code to deal with columns A / B / C

Hope it is clear
Thanks advanced for help