That doesn't quite work with my Excel 2010 (don't know about newer versions)
If an entry is made in a 'normal' cell it's fine but a selection via data validation drop down doesn't fill in on the other sheets.
I would need to use a macro in the 'ThisWorkbook' module
Something along the lines of this
Code:
Private Sub Workbook_SheetChange(ByVal Sh As Object, ByVal Target As Range)
Dim i As Long, sht, shtsArr
' only one cell ?
If Target.CountLarge > 1 Then Exit Sub
' within chosen range ?
If Intersect(Target, Sh.Range("C2:C20")) Is Nothing Then Exit Sub
' which sheets ?
shtsArr = Array("Sheet1", "Sheet2", "Sheet3", "Sheet4", "Sheet5", "Sheet6")
' is this a sheet in shtsArr ?
For Each sht In shtsArr
' if so
If Sh.Name = sht Then
' disable events
Application.EnableEvents = False
' write to each sheets in shtsArr
For i = 0 To UBound(shtsArr)
Sheets(shtsArr(i)).Range(Target.Address) = Target.Value
Next i
' re-enable events
Application.EnableEvents = True
' no need to check further once found
Exit For
End If
Next sht
End Sub