I am offering some freebies to listeners of a podcast I was on, and I was trying to figure out if there was a way to opt them in to my main newsletter list while still keeping track of them/where they came from. I did some asking around, and I got the suggestion to create a new list, and then later export that list, save it, and import those people into my main list, into a descriptive group. I think I can do this. I'm also trying to save some notes for myself and links to help on Mailchimp for future reference. When I don't create these often I forget how to do it. Do any of you have different groups in your mailing list?