app/assets/javascripts/admin/spree/orders/use_billing.js
$(document).ready(function() {
var order_use_billing_input = $('input#order_use_billing');
var order_use_billing = function () {
if (!order_use_billing_input.is(':checked')) {
$('#shipping').show();
} else {
$('#shipping').hide();
}
};
order_use_billing_input.click(function() {
order_use_billing();
});
order_use_billing();
});