When you open up or download your list you will see all of itracMarketer’s standard attributes (first name, last name, mailing address, etc.). If you wanted to add custom attributes to your list, you can easily do so:
Navigate to Lists and then Manage Lists.
Find your list and then click on Edit under Custom Attributes.
Choose which custom attribute(s) you want to add to your list by checking the check box.
You will now see the field in your list.