In your functions.php
you can register new sidebars with this code
/**
* Registers sidebars
*
* @param array Array with default or specified array values
* @since 1.0.0
*/
if ( function_exists( 'register_sidebar' ) ) {
register_sidebar( array (
'name' => esc_html__( 'Primary Sidebar', 'mytheme'),
'id' => 'primary-widget-area',
'description' => esc_html__( 'The Primary Widget Area', 'mytheme'),
'before_widget' => '<div id="%1$s" class="widget %2$s">',
'after_widget' => '</div>',
'before_title' => '<div class="sidebar-widget-heading"><h3>',
'after_title' => '</h3></div>',
) );
register_sidebar( array (
'name' => esc_html__( 'Secondary Sidebar', 'mytheme'),
'id' => 'secondary-widget-area',
'description' => esc_html__( 'The Secondary Widget Area', 'mytheme'),
'before_widget' => '<div id="%1$s" class="widget %2$s">',
'after_widget' => '</div>',
'before_title' => '<div class="sidebar-widget-heading"><h3>',
'after_title' => '</h3></div>',
) );
}
You can add as many sidebars as you want to.