Add the basic version

CROSS.bas

@@ -0,0 +1,5 @@
+Attribute VB_Name = "CROSS"
+Sub CROSS(ByVal Target As Range, Cancel As Boolean)
+	If UCase(Target) = "x" Then Target = "" Else Target = "x"
+		Cancel = True
+End Sub

DUPLICATION.bas

@@ -0,0 +1,14 @@
+Attribute VB_Name = "DUPLICATION"
+Sub DUPLICATION()
+    With Sheets("SHEET1")
+        dl = .Cells(Rows.Count, 1).End(xlUp).Row
+        Set ws = Sheets("SHEET2")
+        NB = 6
+        k = 1
+        For i = 1 To dl
+            .Cells(i, 1).Copy ws.Cells(k, 1).Resize(NB)
+            k = k + NB
+        Next i
+    End With
+End Sub
+