To create a copy/duplicate an already existing list:
- Click on the 3 dots next to the list name
Hit βDuplicateβ button

The list will appear on the board, all the tasks settings (due dates, assignees, priority levels) will be copied as well

- That's it, after that you can use the list as a template for further tasks
Duplicated lists function as fully independent items, the actions from one are not mirrored to the duplicate.