Thank you for reaching out to Constant Contact API Developer Support and for your patience. My team is here to assist outside software developers with questions about building into Constant Contact's API.
Based on some of your other recent posts, it sounds like your request is regarding the Contacts Redesign, rather than how to complete this action through an application you’ve developed using our API.
Thanks so much for your feedback. The feature request "Contacts Redesign - Manage Multiple Lists At Once" has been tracked with your account. This issue is currently under review and consideration by our engineering team. I have set the ticket to notify, so that if this ticket is closed or updated in the future you will receive an email notification. Your feedback and experience with this request is essential to improving our product, so thank you for reaching out to us regarding this matter.