I followed your instructions and successfully created a page with sidebar. So now I got the desidered page layout template. About navigation item, inside the sidebar, I would like to get some link to internal page of site. Let me explain better… let’s suppose that I have selected the item “matematica” in the header navigation, I would like to have specific menu item inside sidebar navigation, each item that links to specific mathematics topic page that I’ve created.
I have attached (bottom) an example screen of the page I would like to create
This kind of vertical menu should be placed only on some specific page, not on all pages. I need also to keep the main top horizontal navigation menu in all page of site.