Editing Mailing Lists

Hi, I would like to create different mailing lists to different customers. How can I change and move around (to different lists0 the contacts I've got from website subscribers? If I delete and add them again to a different Mailing list am I going to trigger another automatic email to my subscribers telling them they are now subscribed to my website? Tks

No, there is no trigger or opt-in email if you add the info manually. I’ve separated out email lists by exporting to cvs, duplicating the file, editing the rows, then importing back into different lists.