file.php

<?php 

 add_filter( 'genesis_attr_nav-secondary', 'gsbb_menu_second_align_left', 10, 2 );
 function gsbb_menu_second_align_left( $attributes, $gs_class ) {
	if ($gs_secondary_alignment == 'menu_sencond_align_left'){
		
			$gs_class = "nav-left";
		
		} else if ($gs_secondary_alignment == 'menu_second_align_right') {
		
			$gs_class = "nav-right";
		
		} else if($gs_secondary_alignment == 'menu_second_align_center'){
		
				$gs_class = "nav-center";
				
		}
	
	 
	 $attributes['class'] = $gs_class;
	 return $attributes;
	}