I only get the option to add an item to the main watchlist. For years previously I could select a drop down to add the item to a custom list. Now you have to add it to the watchlist, then go to the watchlist page, select the item, then add it to a custom list. BUT if you then delete it from your main watchlist, it will also remove it from your custom watchlist. Which means you still have to keep every single item on your main watchlist anyway.
