Combine duplicate rows in a loop vba - excel

Question

I want to combine duplicate rows with the same A and C columns values and sum their cells values for the column B (by adding the value of the textbox2 from the duplicate to the original). My problem is about the condition of the "If" in the Loop. It doesn't consider those conditions when I have duplicates and just add a new row. Is there a better way to do this?
Private Sub CommandButton1_Enter()
ActiveSheet.Name = "Sheet1"
Dim lastrow As Long
With Sheets("Sheet2")
lastrow = .Cells(Rows.Count, "H").End(xlUp).Row
For x = lastrow To 3 Step -1
For y = 3 To lastrow
If .Cells(x, 1).Value = .Cells(y, 1).Value And .Cells(x, 3).Value = .Cells(y, 3).Value And x > y Then
.Cells(y, 8).Value = .Cells(y, 8).Value + TextBox2.Text
.Cells(y, 2).Value = .Cells(y, 2).Value + TextBox2.Text
.Rows(lastrow).EntireRow.Delete
Else
.Cells(lastrow + 1, 8).Value = TextBox2.Text
.Cells(lastrow + 1, 2).Value = TextBox2.Text
.Cells(lastrow + 1, 1).Value = TextBox1.Text
.Cells(lastrow + 1, 3).Value = TextBox3.Text
Exit For
End If
Next y
Next x
End With
End Sub
Here's a picture of the data
There's no blank cell in the column H (I changed the color of the font to make it invisible).

Answer 1

Create a primary key by joining the 2 columns with tilde ~ and use a Dictionary Object to locate duplicates.
Option Explicit
Private Sub CommandButton1_Click()
Dim wb As Workbook, ws As Worksheet
Dim iLastRow As Long, iRow As Long, iTarget As Long
Set wb = ThisWorkbook
Set ws = wb.Sheets("Sheet2")
iLastRow = ws.Cells(Rows.Count, "H").End(xlUp).Row
Dim dict As Object, sKey As String
Set dict = CreateObject("Scripting.Dictionary")
' build dictionary and
' consolidate any existing duplicates, scan up
For iRow = iLastRow To 3 Step -1
' create composite primary key
sKey = LCase(ws.Cells(iRow, 1).Value) & "~" & Format(ws.Cells(iRow, 3).Value, "yyyy-mm-dd")
If dict.exists(sKey) Then
iTarget = dict(sKey)
' summate and delete
ws.Cells(iTarget, 2) = ws.Cells(iTarget, 2) + ws.Cells(iRow, 2)
ws.Cells(iTarget, 8) = ws.Cells(iTarget, 8) + ws.Cells(iRow, 8)
ws.Rows(iRow).EntireRow.Delete
Else
dict(sKey) = iRow
End If
Next
' add new record from form using dictionary to locate any existing
iLastRow = ws.Cells(Rows.Count, "H").End(xlUp).Row
sKey = LCase(TextBox1.Text) & "~" & Format(DateValue(TextBox3.Text), "yyyy-mm-dd")
If dict.exists(sKey) Then
iTarget = dict(sKey)
ws.Cells(iTarget, 2) = ws.Cells(iTarget, 2) + TextBox2.Text
ws.Cells(iTarget, 8) = ws.Cells(iTarget, 8) + TextBox2.Text
Else
iTarget = iLastRow + 1
ws.Cells(iTarget, 1) = TextBox1.Text
ws.Cells(iTarget, 2) = TextBox2.Text
ws.Cells(iTarget, 3) = TextBox3.Text
ws.Cells(iTarget, 8) = TextBox2.Text
End If
End Sub