how can we add sub-tasks in the iPhone version of todoist? i can easily add sub-tasks in my android but its confusing to do so in my iPhone. All i see when i'm adding a task, there's a option below for sub-tasks. When i click on that i see four options 'no' 'level 1' 'level 2' 'level 3' 'level 4' and i'm not sure to do with them.
Thanks in advance.