Today WhatsApp has released a new feature - custom lists. These are the evolution of chat filters, introduced earlier this year as a way to find messages faster.
With custom lists, you can filter your chats into custom categories of your choice - you can have a list for anything: family, work, your neighborhood, and so on.
Creating a new list is as easy as tapping the + in the filter bar at the top of your Chats tab in WhatsApp. To edit a list, long-press it.
In a similar way to your favorites, you can add both groups and one-on-one chats to any list. All the lists you create will appear in the filter bar.
The rollout for this feature has already started but it will take a few weeks for it to become available to every WhatsApp user out there.