This functionality serves the benefit of categorizing your lists as statuses that can be visualized on the milestone screen with a start and end date. When tasks within that list are completed, your milestones will visually update their progress in real-time. 

In this example, we have three separate marketing campaigns broken into lists that have tasks for the different marketing channels.

A task list can be converted into a milestone by hovering over the list's option menu and selecting "set task list as milestone."

Tasks in this list are automatically tied to a new "Campaign 1" milestone and will remain tied to this milestone unless they are manually tied to a new milestone or are moved into a different milestone task list. 

Similarly, tasks added into this list will now be automatically tied to the Campaign 1 milestone.

Note: Deleting the milestone created from this list will revert this list to a normal task list and will untie the tasks in the list.

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