Adding Code to an Existing UserForm with VBA

Hello All

I hope someone can help me.

Is it possible to add some code to an existing UserFrom with VBA only?

I have around 50 spreadsheets that are being used by employees to record their work. I have now written a script to make some adjustments to these sheets and update them. The intention is that I will send out a sheet with a macro that will adjust and update their time sheet for them.

The script now does almost everything I want it to, however I would like to be able to add the following code to an existing UserForm in the workbook called "NewSheet"

Private Sub UserForm_Initialize()
   Me.Year.Value = ThisWorkbook.Sheets("Sheet1").Range("N15").Value
End Sub

Sorry for the long winded description but I wanted to explain why I want to make this seeming minor change through VBA.

Thanks in advance for any help you can provide.

Cheers

Jim