You're not giving us much to go on. Where is the 'data' to which you
refer. In a table? A query? Which versions of Access and Excel? When
this separate file saves, should it also contain the rest of the Excel
sheet to which you imported the data, or just the data  itself? (NB in
the latter case, it will be much, much easier simply to export to a file
straight from Access.)

The more detail we have, the more likely we are to be able to help.