Hi,
you have to add "attributes" to the participant table.
Your csv file looks like this
firstname;lastname;email;attribute_1;attribute_2;attribute_3
John;Doe;john.doe@example.com;Johnny;43;South
Jane;Dee;jane.dee@example.com;Jenny;37;North
...
You can use these information in your survey by ExpressionScript like {TOKEN:ATTRIBUTE_1}
And if your survey is not anonymous you can export these fields
Joffm