Если мастер-файл никогда не изменяется, возможно:
Sub UpdateSomeLinks()
Dim wb As Workbook
Dim ws As Worksheet
Dim rngLinks As Range
Dim strDate As String
'sets variables
Set wb = myworkbook
Set ws = wb.Worksheets("myworksheet")
Set fd = Application.FileDialog(msoFileDialogFilePicker)
'input box for date
strDate = InputBox("Please type in new date")
'only loops through formula cells
For Each rngLinks In ws.UsedRange.SpecialCells(xlCellTypeFormulas)
rngLinks.Formula = Replace(rngLinks.Formula, "olddate", strDate)
Next rngLinks
'cleanup
Set ws = Nothing: Set wb = Nothing
Set rngLinks = Nothing: Set fs = Nothing
End Sub
Затем, возможно, кнопка на рабочем листе, которая вызывает вышеуказанную подпрограмму.