Code to be added to Genesis functions.php to have a portfolio custom post type with archive support

register portolio cpt functions.php

<?php
/* Do not remove this line. Add your functions below. */

	// Register Portfolio Items Custom Post Type
function register_portfolio() {

    $labels = array(
        'name'                => _x( 'Portfolio Items', 'Post Type General Name', 'text_domain' ),
        'singular_name'       => _x( 'Portfolio Item', 'Post Type Singular Name', 'text_domain' ),
        'menu_name'           => __( 'Portfolio Items', 'text_domain' ),
        'parent_item_colon'   => __( 'Parent Portfolio Item:', 'text_domain' ),
        'all_items'           => __( 'All Portfolio Items', 'text_domain' ),
        'view_item'           => __( 'View Portfolio Item', 'text_domain' ),
        'add_new_item'        => __( 'Add New Portfolio Item', 'text_domain' ),
        'add_new'             => __( 'Add New Portfolio Item', 'text_domain' ),
        'edit_item'           => __( 'Edit Portfolio Item', 'text_domain' ),
        'update_item'         => __( 'Update Portfolio Item', 'text_domain' ),
        'search_items'        => __( 'Search Portfolio Item', 'text_domain' ),
        'not_found'           => __( 'Not found', 'text_domain' ),
        'not_found_in_trash'  => __( 'Not found in Trash', 'text_domain' ),
    );
    $args = array(
        'label'               => __( 'portfolio', 'text_domain' ),
        'description'         => __( 'Portfolio Item Sections', 'text_domain' ),
        'labels'              => $labels,
        'supports'            => array( 'title', 'editor', 'excerpt', 'thumbnail', 'trackbacks', 'revisions', 'custom-fields', 'post-formats', 'genesis-seo', 'genesis-cpt-archives-settings', 'genesis-simple-sidebars',),
        'taxonomies'          => array( 'category', 'post_tag' ),
        'hierarchical'        => false,
        'public'              => true,
        'show_ui'             => true,
        'show_in_menu'        => true,
        'show_in_nav_menus'   => true,
        'show_in_admin_bar'   => true,
        'menu_position'       => 5,
        'menu_icon'           => 'dashicons-portfolio',
        'can_export'          => true,
        'has_archive'         => true,
        'exclude_from_search' => false,
        'publicly_queryable'  => true,
        'capability_type'     => 'post',
    );
    register_post_type( 'portfolio', $args );

}

add_action ('init', 'portfolio_sidebars_support');
function portfolio_sidebars_support() {
	add_post_type_support( 'portfolio', 'genesis-simple-sidebars' );
}

// Hook into the 'init' action
add_action( 'init', 'register_portfolio', 0 );