Sync BuddyPress Profile Fields with PMPro using Register Helper

my_pmpro_sync_xprofile_to_member_directory.php

<?php

/**
 * Based on the Register Helper example.
 * We've added a "buddypress" option for each field
 * set to the XProfile name we used when setting up
 * the fields in the BuddyPress extended profile.
 * If the PMPro BuddyPress Add On is activated
 * then the fields will be synchronized.
 * Register Helper: https://www.paidmembershipspro.com/add-ons/pmpro-register-helper-add-checkout-and-profile-fields/
 * PMPro BuddyPress: https://www.paidmembershipspro.com/add-ons/buddypress-integration/
 */

function my_pmprorh_init() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}
  
	// define the fields
	$fields = array();
	$fields[] = new PMProRH_Field(
		'company',                      // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'Company',       // XProfile Field Name <-- !!!
			'label'     => 'Company',       // custom field label
			'size'      => 40,              // input size
			'class'     => 'company',       // custom class
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);
	$fields[] = new PMProRH_Field(
		'name_of_product_or_service',       // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'Name Of Product Or Service',       // XProfile Field Name <-- !!!
			'label'     => 'Name Of Product Or Service',       // custom field label
			'class'     => 'name_of_product_or_service',       // custom class
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);
	$fields[] = new PMProRH_Field(
		'website',                      // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'Website',       // XProfile Field Name <-- !!!
			'label'     => 'Website',       // custom field label
			'size'      => 80,              // input size
			'class'     => 'website',       // custom class
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);
	$fields[] = new PMProRH_Field(
		'city',                      // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'City',       // XProfile Field Name <-- !!!
			'label'     => 'City',       // custom field label
			'size'      => 40,              // input size
			'class'     => 'city',       // custom class
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);
	$fields[] = new PMProRH_Field(
		'state',                      // input name, will also be used as meta key
		'text',                         // type of field
		array(
			'buddypress' => 'State',       // XProfile Field Name <-- !!!
			'label'     => 'State',       // custom field label
			'size'      => 40,              // input size
			'class'     => 'state',       // custom class
			'profile'   => true,            // show in user profile
			'required'  => true,            // make this field required
		)
	);
  
	// add the fields into a new checkout_boxes are of the checkout page
	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes',               // location on checkout page
			$field                          // PMProRH_Field object
		);
	}
	// that's it. see the PMPro Register Helper readme for more information and examples.
}

add_action( 'init', 'my_pmprorh_init' );

@bjspi it should work for dropdown fields too, I made an example here please: https://gist.github.com/MaryOJob/cae7b4f284234a714be1a6aaceb05c70