To make a copy of any existing Dynamic List in Funnel, simply navigate to the list and click the three dots in the top right-hand corner. Then select 'Duplicate List.'
Once you've selected 'Duplicate List,' the new list will be created with (copy) at the end of the list name, prompting you to rename your new list.
Once you've renamed the dynamic list and made any amendments to the conditions, you can select 'save dynamic list'.