To Do Lists are organized into folders called "List Sets." This allows you to group similar lists together and keep them organized within your account. You also have the option of moving To Do Lists from one folder set to other folder sets in your account. When you move your To Do Lists any priorities, statuses, due dates, etc. will be preserved on all of your Tasks. Follow the steps in the image below:
Please note that if you move your To Do List the link for your To Do List will have changed and old links for your To Do List will not work anymore.