Hello @Naples_Bridge_Center ,
You can go into the 2024 list, click the top-most checkmark box to select-all the contacts, then click the Actions button at the top. Select the Remove from list option, and select the 2023 list to remove all contacts in the 2024 list from the 2023 one.
For step-by-step and visual guidance on this process, please see this article for removing contacts from lists.
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