Dynamic dropdown creation in excel?

Question

I am trying to create two drop down where the first one will have Years and the second one will have months. If I select year 2015, 2nd dropdown should display only months from Jan to Sep. If I select year 2014, 2nd drop down should display all months. Could any one of you help me to od this in excel?

Answer 1

Try this short macro:

Sub DVSetup()
    Range("A1:B1").Clear
    With Range("A1").Validation
        .Delete
        .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _
        xlBetween, Formula1:="2014,2015"
        .IgnoreBlank = True
        .InCellDropdown = True
        .InputTitle = ""
        .ErrorTitle = ""
        .InputMessage = ""
        .ErrorMessage = ""
        .ShowInput = True
        .ShowError = True
    End With

    For i = 1 To 12
      Range("C" & i).Value = Format(DateSerial(2000, i, 1), "mmm")
    Next i

    With Range("B1").Validation
        .Delete
        .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _
        xlBetween, Formula1:="=IF(A1=2014,C1:C12,C1:C9)"
        .IgnoreBlank = True
        .InCellDropdown = True
        .InputTitle = ""
        .ErrorTitle = ""
        .InputMessage = ""
        .ErrorMessage = ""
        .ShowInput = True
        .ShowError = True
    End With

End Sub

It sets up DV in cell A1 to allow a pick between 2014 and 2015. It also sets up DV in cell B1 to allow the correct month range for each year selected in A1 .