Add Line Items to Sales Order (SuiteScript)

We are having a Thanksgiving sale and I need to create a script that will add free bonus items to our web store orders based on their order total. Here was my original script:

 function SalesOrder_beforeSubmit(type)  {      // Execute this only when Sales order is created   if (type == 'create')  {          // just report that the type is create    nlapiLogExecution('DEBUG', 'type argument', 'type is create');          // Get the current record    var currentRecord = nlapiGetNewRecord();            // Get the order total    var total = parseInt(currentRecord.getFieldValue("total"));     nlapiLogExecution('DEBUG', 'order total', total);           // Get the number of line items before submit      var lines = currentRecord.getLineItemCount('item');      nlapiLogExecution('DEBUG', 'number of line items', lines);       // Add a new line item for the coin figures based on the order total    if ( total > 299 ) {     currentRecord.selectNewLineItem('item');     currentRecord.setCurrentLineItemValue('item', 'item', 33);      currentRecord.setCurrentLineItemValue('item',