VBA code to add duplicates and remove - vba

Question

I am really stuck on a code for this form.
I want to create a command button that will allow the user to simplify the report and combine all like items and remove the duplicates. This will be used a Purchase request. I've attached a photo of the form here ->
Form
I need the button to find duplicates in column C and sum the totals from column F and then remove duplicates leaving the original behind with a grand total in the QTY menu. Is that possible and still keep it on the same sheet or would it be better to have it duplicate to a new sheet?

Answer 1

If the key is column C, this macro should do what you want, attach it to the button. To make it changeable easily for the key column, I defined the key as a constant and set it to 3 for now (col C):
Sub ProcessForm()
Dim wholeRange As Range, i As Long, ar
Const key As Long = 3 ' <-- column C is key. Set to 1 if col A
With Worksheets("Order")
Set wholeRange = .Range("A5:G" & .Cells(.Rows.Count, key).End(xlUp).row)
End With
With wholeRange
ar = .Columns(key).value
For i = 1 To UBound(ar)
ar(i, 1) = WorksheetFunction.SumIfs(.Columns(6), .Columns(key), ar(i, 1))
Next
.Columns(6).value = ar
.RemoveDuplicates key
End With
End Sub

Answer 2

Sub main()
Dim cell As Range
With Worksheets("Order")
With .Range("C5", .Cells(.Rows.Count, 3).End(xlUp))
For Each cell in .Cells
cell.Offset(,3).Value = WorksheetFunction.SumIf(.Cells, cell, .Offset(,3))
Next
.Offset(, -2).Resize(, 7).RemoveDuplicates Columns:=Array(3), Header:=xlNo
End With
End With
End Sub

Answer 3

Without seeing your code its difficult to say what your stuck on but here is quick example on How to search duplicates and sum the value
I'm using WorksheetFunction.Match Method (Excel)
Option Explicit
Sub Example()
' // Declare Variables
Dim DupRow As Variant
Dim i As Long
Dim LastRow As Long
Dim Sht As Worksheet
Set Sht = ThisWorkbook.Sheets("Sheet1")
With Sht
LastRow = .Cells(Rows.Count, "C").End(xlUp).Row
For i = LastRow To 2 Step -1
' // Columns 3 (C) DupRow
DupRow = Application.Match(Cells(i, 3).Value, Range(Cells(1, 3), Cells(i - 1, 3)), 0)
If Not IsError(DupRow) Then
' // Columns 6 (F) sum Match
Cells(i, 6).Value = Cells(i, 6).Value + Cells(DupRow, 6).Value
Rows(DupRow).Delete ' Delete DupRow
End If
Next i
End With
End Sub