Update PMPro Register Helper fields after they've been setup, e.g. to add them to the Add Member screen.

my_update_rh_fields.php

/**
 * Update RH fields after they've been setup.
 * The example below sets the addmember property to true.
 * Add this code to a custom plugin or Code Snippet.
 */
function my_update_rh_fields() {
    global $pmprorh_registration_fields;

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

    // add field names to look for
    $fields_to_update = array( 'company', 'budget' );
    
    foreach( $pmprorh_registration_fields as $locations => $fields ) {
        foreach( $fields as $field ) {
            if( in_array( $field->name, $fields_to_update ) ) {
                // updates to be made to the field
                $field->addmember = true;
            }
        }
    }    
}
add_action( 'init', 'my_update_rh_fields', 20 );