Is there a multi-level task manager?

Question

Task Management

Good day, please advise a free manager for personal tasks, not teamwork.
Where there are several levels, usually where I saw (Remember The Milk, Wunderlist) there are a maximum of 2-3 (list, task, subtask).
It is desirable to be able to create a more complex hierarchy of 4 or more levels:
That is, the ability to create subgroups.
For example: Shopping - Shoes - the task is to buy sneakers - subtask 1 is to choose a quality model with a vibram sole. Subtask 2 find running shoes for sale. etc.
Example 2: Work - SEO - site.ru - internal optimization - the task is to rewrite the text on the main page.
Also would like to see:
Russian interface, application for Windows and Android, notes (or comments) for each task and subtask. Different levels of priorities for tasks, reminders, etc.

Answer 1

I’ll risk seeming immodest, but betasked.ru
All of the above is there, except that we didn’t develop applications, but limited ourselves to normal two-way synchronization with Google tasks, as a result, we use any application for Gtasks as a mobile client.
And with a full-fledged hierarchy of managers is not enough, yes. Apparently, few people need it.

Answer 2

https://asana.com/

Answer 3

For the desktop, a great program is TaskCoach. True, it has not been updated for a long time. Here is a good tutorial on working with it.