Solved, thanks.
For those who are looking for solution:
1) under /page-templates/ create new template with:
<?php
/*
Template Name: Bios
*/
get_header(); ?>
<div id=”primary” class=”site-content”>
<div id=”content” role=”main”>
<div id=”custom-sidebar”>
<?php
if ( !function_exists(‘twentytwelve_widgets_init’) || !dynamic_sidebar(‘sidebar-5’) ) :
endif; ?>
<div style=”clear:both”></div>
</div>
<?php while ( have_posts() ) : the_post(); ?>
<?php if ( has_post_thumbnail() ) : ?>
<div class=”entry-page-image”>
<?php the_post_thumbnail(); ?>
</div><!– .entry-page-image –>
<?php endif; ?>
<?php get_template_part( ‘content’, ‘page’ ); ?>
<?php endwhile; // end of the loop. ?>
</div><!– #content –>
</div><!– #primary –>
<?php get_footer(); ?>
2) under functions.php add
register_sidebar( array(
‘name’ => __( ‘sidebar-4’, ‘twentytwelve’ ),
‘id’ => ‘sidebar-4’,
‘description’ => __( ‘Submenu’, ‘twentytwelve’ ),
‘before_widget’ => ‘<aside id=”%1$s” class=”widget %2$s”>’,
‘after_widget’ => ‘</aside>’,
‘before_title’ => ‘<h3 class=”widget-title”>’,
‘after_title’ => ‘</h3>’,
) );
And replace ID, name, Description in functions.php and ID in page template.
Then you should play with CSS and that’s it.