Invoicing Based On Product And Order Number?

I am trying to develop an invoicing system for my company. Most of our customers will have their invoices formatted a certain way which has been relatively easy to solve, however one customer needs to have their invoices formatted in a special way.I have a sheet that pulls in a list formatted like this:

Date product order number kilos
07/4/14 48% cream 445600 1000
07/4/14 PHM 445600 1500
07/4/14 PHM 445600 1000
07/4/14 PHM 445600 2000
10/4/14 48% cream 445800 500

What I need it to display is the following:

Date Product order number kilos
07/4/14 48% cream 445600 1000
10/4/14 48% cream 445800 500
07/4/14 PHM 445600 4500

So you can see it is grouping the invoice by both product type and order number but grouping by product.