I want show 2 menu in one layout

For example: MENU Page_1 Page_2 -- Page_2a --Page_2b Page_3

If active Page_1 or Page_2 i see one menu. Then active Page_2, i see second menu with items wich parent is Page_2. It will be Page_2a and Page_2b

In over words i want make second menu dynamicly show only children items depending on first menu active parent.

How to achive this ?

You would have to do this in different files. For this example, I've assumed that you want a top nav (which is menu 1) and a secondary nav (which is menu 2). Both of these are horizontal.

So, your layout would have the top nav always visible. The secondary nav partial would be different depending on which page you're on. So, if you visit Page_2 then you load the partial Page_2, which would contain the menu with the page_2a and page_2b visible in it.

Will that work for your situation?