Add PMPro User Fields as fields for Add Member from Admin.

my-pmpro-set-user-field-addmember.php

<?php
/**
 * Set addmember attribute on user fields to true.
 *
 * This will add the field to the Add Member from Admin page in the
 * administration area.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */


function my_pmpro_set_user_field_addmember( $field, $where ) {
	$field->addmember = true;
	return $field;
}
add_filter( 'pmpro_add_user_field', 'my_pmpro_set_user_field_addmember', 10, 2 );