I actually need to implement a secondary vertical menu like in here: http://www.adverum.lt/lt/paslaugos/korporatyvine-komunikacija
It has to be vertical and it looks like it based on frames, but as I know frames are obsolete, so how should I do this? Is there a plugin for this?
It sounds like you’re looking for a sub-menu for the current menu item from another menu – if that makes sense itself 😉
One that I’ve personally used with great success is Advanced Menu Widget. Tons of options and does exactly what you want. Thanks!
Its hard to guess what exactly you are asking, If I’m not being wrong, that menu is like a list of WordPress categories. If your theme supports one Dynamic Sidebars, then you can simply drag a category list widget into it, and a list of all categories will appear in your site’s sidebar.
You can manually edit your themes sidebar to include wordpress function –
wp_list_category(), which will list all the categories.