Is Interbase an ODBC compliant database or does it have an
ODBC tool associated with it? If so, then you should be
able to do: File / Get External Data / Import (or Link)
and pull the information directly from your Interbase db.
Since you stated that you can export from interbase into
access format, I would have to believe that the above
would work.
If not, then I don't believe there is a way to do what you
want. Either way, you would have to create the
relationships manually in access.
I could be wrong though, I'm new at this.