How enter into sub level

Good day.
I have next structure of the menu

and I want insert navigation bar like: when I press "next" I will go from level1...n to level2 1. Than from level3 2 to level1...n+1.
I tried to use sublingNav but it works only on one levels. For example from level...n I go to level...n+1 and skip all sublevels.
What should I do?

This sounds like a really custom use case... I don't know if there's an easy way to build this, and I certainly wouldn't expect to find something off-the-shelf for it. Maybe you could do this by feeding a "parent" parameter to a getResources or a Wayfinder call?

Can you give me some examples please? With wayfinder I made menu, but I realy don't know how use it to make navigation in document tree. I read that this problem can be solve by php function, but I don't have knowledge about it(

I can't post examples because what you've asked for is essentially a 100% custom implementation -- I would have to code an entire solution for you, and this looks like it would be quite difficult. I would strongly recommend that abandon this approach and instead use a conventional menu, especially if you're not solid on PHP and Javascript. It will be much much easier in my opinion.

Thank you for participation. I tried to do it for three days and I'm going to madness with this menu. It's look like well without it, and let it be!

I wonder if this is the kind of menu you're talking about: http://bobsguides.com/modx.html (or if it would work for you instead of what you planned)?

May be it will help to some one. I think I was going by easiest way. I made couple TV like url and add it to template. Unfortinatule now I should write url for every post, but it's working as I want))