Import match, and replace

[Anders]

Hello

I maintain a list of journals, which are managed by FMPro41 and Web Companion. A part of the list is created by importing an Excel-file provided by a database host. This list contains a lot of journals. For certain reasons I would like to be able to:

a) import match, and replace information in a record that in a certain field is identical whereas other fields may differ. But not change information in some of the fields. Every journal is supposed to have a unique identifier called ISSN (International Standard Serial Number).

get an X in a check-box, or something else when a match isn't found. Just so that I may search and find those that were imported whithout replacing anything.

Is this at all possible?

TIA

Anders