So, what if you create multiple lists, but the default columns are not enough information. You are able to create additional columns to hold additional data about your contacts.
While your on the Lists tab, click on ‘Manage Fields’ in the left submenu.
Then, click on the ‘Add a Field’ button.
Lastly, enter the FIELD NAME, and select your field type. 99% of the time you will select either ‘text input’ or ‘date’. To finish, click ‘Add’
Now, your custom field(s) will display below the default columns.