Bonjour,
Dans le cas où votre tableau commence en cellule A1, un code VBA possible :
Sub TransfoDonnees()
Dim L1 As Integer, L2 As Integer, L3 As Integer
With Sheets("NomFeuille") 'Nom à adapter
For L1 = 1 To .Range("B" & Rows.Count).End(xlUp).Row
For L2 = 1 To .Range("A" & Rows.Count).End(xlUp).Row
L3 = L3 + 1
.Range("D" & L3) = .Range("A" & L2)
.Range("E" & L3) = .Range("B" & L1)
Next L2
Next L1
End With
End Sub