import data in an exist collum in database

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i´ve got a database with 14 k clients
i need to add more 5 k to this database

but when i import via form like the tutorial
these new informations (5k) came as new collums

is there any possibility to import in the existing collums ?

for ex
i´ve got a collum in the database that calls NOME FANTASIA
if i import the data will appear in a new collum name NOME FANTASIA 1

is there any possibility that i import the data and appear in the collum NOME FANTASIA (that already exist)?