submitting new record and having access to it's ID

I have a system I'm designing where I will be creating records, then passing those new records onto other methods for additional processing.  When I create the new record I would like to be able to have my other methods treat it as if it's a record that already existed.

For example:

 this.ProcessSalesOrder = function(salesOrder)  {      this.CheckRecordTypeThrowIfError(salesOrder, REC_IDS.SO);      this.AddProcessingRecordTrace(salesOrder);                //  Check the status of the sales order, if it's fulfilled then       //  we can Invoice it.      if(salesOrder.getFieldValue(SO_FIELDS.STATUS) == TRANS_STATUS_LIST.PEND_BILLING)      {          //  Create the invoice record          var invoice = nlapiTransformRecord(REC_IDS.SO, salesOrder.getId(), REC_IDS.INVOICE);                        //  Set the invoice date to the same as the sales order date          invoice.setFieldValue(TRANSACTION_FIELDS.DATE, salesOrder.getFieldValue(TRANSACTION_FIELDS.DATE));                        this.SubmitRecord(invoice, true, true);                        //  now process the Invoice          this.ProcessInvoice(invoice);      }  }    this.ProcessInvoice = function(invoice)  {      this.CheckRecordTypeThrowIfError(invoice, REC_IDS.INVOICE);      this.AddProcessingRecordTrace(invoice);              }    AutoMgr.prototype.AddProcessingRecordTrace = function(record)  {      this.AddTrace('Processing ' + record.getRecordType() + ' ' + record.getId());      this.IncrementProcessedRecordCount();  }    this.SubmitRecord = function(record, doSourcing, addNote)  {      //  determine if this record