Duplicate rows

Hello. I need to create a sheet that will store committee names that will continuously be updated and needing to be approved by multiple colleagues. Every time I need to have the committee names approved, I would like to be able to dump the entire list that originates from a different source into smartsheets, including the committee names that have already been approved. When I dump the entire list in, is there a way for smartsheets to not paste in records that already exist based on a unique primary key?

Thank you very much!

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