Remember to upload all the contacts to either the Event or News lists. You can use a variety of techniques to segment lists. Please reach out to ATW, if you are uncertain as to the best way to add a new segment to one of your lists, or if you feel you need a new main list.
Make sure the custom field you will use use exists. Then the contact is uploaded with custom field as the header in a column. The cells in that column are all giving a specific value. And the contacts are uploaded into iContact using a CSV (Comma Delimited) file.
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