And if you want to use VBA, then use the following:-
Sub Concat()
Dim LastRw As Long
Dim Rng As Range
Dim str As String
str = Range("A1"

.Value
LastRw = Cells(Rows.Count, "A"

.End(xlUp).Row
Set Rng = Range(Cells(1, "A"

, Cells(LastRw, "A"

)
For x = 1 To Rng.Rows.Count
str = str & "," & Rng.Rows(x).Value
Next x
Range("B1"

= str
End Sub
1) Hit ALT+F11 to get you into the VBE
2) Find your project name in the explorer style interface at the top left pane of the VBE
3) Right click on your project and select 'insert module'
4) Double click on module1 when it appears, and then click into the big white space on the right of your screen when it appears.
5) Paste the code supplied into it
6) Hit File / Close and return to Microsoft Excel
7) Save Workbook
8) Hit Tools / Macros / Macro / Concat
Regards
Ken...............