file1.php

// using version 2.11 of GW_Inventory

new GW_Inventory( array(
    'form_id'                  => 13,
    'field_id'                 => 4.3,
    'stock_qty'                => 3,
    'out_of_stock_message'     => 'Sorry, there is no more Ice Cream!',
    'not_enough_stock_message' => 'You ordered %1$s tickets. There are only %2$s tickets left.',
    'approved_payments_only'   => false,
    'hide_form'                => false,
    'enable_notifications'     => true
));
// Cold Stone Cupcakes
new GW_Inventory( array(
    'form_id'                  => 13,
    'field_id'                 => 6.3,
    'stock_qty'                => 3,
    'out_of_stock_message'     => 'Sorry, there are no more Cupcakes!',
    'not_enough_stock_message' => 'You ordered %1$s tickets. There are only %2$s tickets left.',
    'approved_payments_only'   => false,
    'hide_form'                => false,
    'enable_notifications'     => true
));