You can add Subpaths with Press-Hold on any Waypoint or block in your Home Feed;
(*Beta Testers: Be sure to press 'done' on the keypad after typing your Subpath, then hitting the Orange Done button after you've seen it appear above... we're fixing this soon)
View Subpaths by tapping the Subpath icon on your block—a dropdown checkbox list will appear with your Subpaths for that Waypoint;
Use Subpaths to create lists ('Book lists', 'To-Do lists', etc.), to break down Waypoints into smaller steps, or just to check something off!