Add additional menu items to Paid Memberships Pro admin bar and admin menu link.

pmpro-add-menu-item-links.php

<?php
/**
 * This will add in extra menu items for 'quick' access to the pages. Adjust the code to your linking.
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function add_custom_pmpro_menu_items() {

	//array of all caps in the menu
	$pmpro_caps = pmpro_getPMProCaps();

	//the top level menu links to the first page they have access to
	foreach( $pmpro_caps as $cap ) {
		if( current_user_can( $cap ) ) {
			$top_menu_cap = $cap;
			break;
		}
	}

	if( empty( $top_menu_cap ) ) {
		return;
	}

	add_submenu_page( 'pmpro-dashboard', __( 'Discount Codes', 'paid-memberships-pro' ), __( 'Discount Codes', 'paid-memberships-pro' ), 'pmpro_discountcodes', 'pmpro-discountcodes', 'pmpro_discountcodes' );
	add_submenu_page( 'pmpro-dashboard', __( 'Page Settings', 'paid-memberships-pro' ), __( 'Page Settings', 'paid-memberships-pro' ), 'pmpro_pagesettings', 'pmpro-pagesettings', 'pmpro_pagesettings' );
	add_submenu_page( 'pmpro-dashboard', __( 'Payment Settings', 'paid-memberships-pro' ), __( 'Payment Settings', 'paid-memberships-pro' ), 'pmpro_paymentsettings', 'pmpro-paymentsettings', 'pmpro_paymentsettings' );
	add_submenu_page( 'pmpro-dashboard', __( 'Email Settings', 'paid-memberships-pro' ), __( 'Email Settings', 'paid-memberships-pro' ), 'pmpro_emailsettings', 'pmpro-emailsettings', 'pmpro_emailsettings' );
	add_submenu_page( 'pmpro-dashboard', __( 'Advanced Settings', 'paid-memberships-pro' ), __( 'Advanced Settings', 'paid-memberships-pro' ), 'pmpro_advancedsettings', 'pmpro-advancedsettings', 'pmpro_advancedsettings' );
}
add_action( 'admin_menu', 'add_custom_pmpro_menu_items' );

function pmpro_add_custom_items_admin_bar() {
	global $wp_admin_bar;

	//view menu at all?
	if ( ! current_user_can( 'pmpro_memberships_menu' ) || ! is_admin_bar_showing() ) {
		return;
	}
	
	//array of all caps in the menu
	$pmpro_caps = pmpro_getPMProCaps();

	//the top level menu links to the first page they have access to
	foreach ( $pmpro_caps as $cap ) {
		if ( current_user_can( $cap ) ) {
			$top_menu_page = str_replace( '_', '-', $cap );
			break;
		}
	}

	// Add in quick links for the above submenu pages.
	// link => label
	$menu_items = array(
		'pmpro-discountcodes' 		=> __( 'Discount Codes', 'paid-memberships-pro' ),
		'pmpro-pagesettings' 		=> __( 'Page Settings', 'paid-memberships-pro' ),
		'pmpro-paymentsettings' 	=> __( 'Payment Settings', 'paid-memberships-pro' ),
		'pmpro-emailsettings' 		=> __( 'Email Settings', 'paid-memberships-pro' ),
		'pmpro-advancedsettings'	=> __( 'Advanced Settings', 'paid-memberships-pro' )
	);

	// Add menu items to top bar.
	foreach( $menu_items as $link => $label ) {

		if ( current_user_can( 'pmpro_dashboard' ) ) {
			$wp_admin_bar->add_menu( 
				array(
					'id' => $link,
					'parent' => 'paid-memberships-pro',
					'title' => $label,
					'href' => get_admin_url( NULL, '/admin.php?page=' . $link ) 
				)
			);
		}
	}
}
add_action( 'admin_bar_menu', 'pmpro_add_custom_items_admin_bar', 1000);