Mail Merge with Variable Table Length

Hi,

I have an excel file with the following details:

Invoice No.	Item Code	Amount
490502688	117363	589.00
490502688	117380	713.00
490502689	117380	125.00
490502692	69384	105.00
490502692	105009	735.00
490502692	116531	35.00
490502692	161556	846.00

I need to prepare a Mail Merge of over 100 invoices. Each invoice may have 1 or more item codes. But the mail merge should make the 2nd item to appear on a row below the 1st item if there are more than 1 items against an invoice number.

For example: Invoice Number has 2 item codes against it. So the mail merge automated invoice template should display both the items one below the other along with the amount.