Need help to data for Invoice data entry

[tingxia]

I tried to use If formula in vba to display data on the left(please refer to attached image) to data on the right(if same date, up to 4 data will be in the same row). but my formula is not working. can anyone help me with it? Thank you

Function Invoiced(I As String) As String

If ActiveCell.Offset(0, -2) = ActiveCell.Offset(-1, -2) Then

If ActiveCell.Offset(-1, -2) = ActiveCell.Offset(-2, -2) Then

If ActiveCell.Offset(-2, -2) = ActiveCell.Offset(-3, -2) Then

If ActiveCell.Offset(-3, -2) = ActiveCell.Offset(-4, -2) Then

Invoiced = ActiveCell.Offset(0, -2) + " " + ActiveCell.Offset(0, -1) + " " + ActiveCell.Offset(-1, -1) + " " + ActiveCell.Offset(-2, -1) + " " + ActiveCell.Offset(-3, -1) + " " + ActiveCell.Offset(-4, -1)

Else Invoiced = ActiveCell.Offset(0, -2) + " " + ActiveCell.Offset(0, -1) + " " + ActiveCell.Offset(-1, -1) + " " + ActiveCell.Offset(-2, -1) + " " + ActiveCell.Offset(-3, -1)

End If

Else Invoiced = ActiveCell.Offset(0, -2) + " " + ActiveCell.Offset(0, -1) + " " + ActiveCell.Offset(-1, -1) + " " + ActiveCell.Offset(-2, -1)

End If

Else Invoiced = ActiveCell.Offset(0, -2) + " " + ActiveCell.Offset(0, -1) + " " + ActiveCell.Offset(-1, -1)

End If

Else Invoiced = ActiveCell.Offset(0, -2) + " " + ActiveCell.Offset(0, -1)

End If

End Function

[#2]

@tingxia 

There are many ways to achieve that.

Using Array formulas.  On H1 type the following formula:

=UNIQUE(A1:A16)

On I1 cell the formula

=CONCAT(" " &UNIQUE(FILTER($B$1:$B$16,$A$1:$A$16=H1)))

Using VBA and Dictionary Library 

Option Explicit

Sub InvoiceDataGrouping()
    Dim DataSet As Variant, Counter As Long, Dict As Object
  
    'Set Dict = New Scripting.Dictionary 'Early Binding
    Set Dict = CreateObject("Scripting.Dictionary") 'Late Binding
    
    'stores in an array all the data from columns A and B,
    'starting at A1 and up to the last row with data from column C.
    DataSet = Sheets("WithVBA").Range("A1", Range("B" & Rows.Count).End(3)).Value2
  
    For Counter = 1 To UBound(DataSet)
        
        Dict(DataSet(Counter, 1)) = Dict(DataSet(Counter, 1)) _
                                    + " " & DataSet(Counter, 2)
    Next
  
    Sheets("WithVBA").Range("H1").Resize(Dict.Count, 2).Value = Application.Transpose(Array(Dict.keys, Dict.items))
    
    Set Dict = Nothing
End Sub

 Find attachment