This applies to the Facebook website
The help section on Facebook's site has articles pertaining to how lists can be created, managed and deleted but all this material applies to a version of Facebook that I have been moved on from.
On the latest version of the site, I am trying to find a way to see all my custom lists, see who is a part of them and manage those lists.
I am able to see if a particular friend is part of a list by going to my friends list, finding that friend and seeing what lists they are part of but this is a really cumbersome process.
Edit: a screenshot of what I see on my left menu