Import without duplication

You could create a temporary table and import your raw CSV file into that table.  

Then create a saved a table to table copy to copy from the Raw import table into your real table and select the IP as the Merge field. 

Once you get this working you can make a formula URL button to make it easier for the routine  imports to happen. You could have a formula URL button to take the user to the place where they import the CSV into the Raw Import table, and then another URL formula button to copy from the Raw Import table and merge into the real table.

------------------------------
Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.com
mark.shnier@gmail.com
------------------------------