sure.. respect the external ids, and it will write data back in place...
The help is on the import page!
Can I import several times the same record?
If you import a file that contains one of the column "External ID" or "Database ID", records that have already been imported will be modified instead of being created. This is very usefull as it allows you to import several times the same CSV file while having made some changes in between two imports. OpenERP will take care of creating or modifying each record depending if it's new or not.
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