It would be nice to present the customer with just one product for all different grades.
Perhaps the customer could select the required grade from a drop down menu. However not all grades are the same price, nor are they sold at the same box quantity. For stock control reasons they also need to be handled as a separate products, each grade with their own product code.
Since all all products are already in our database, I don't want to mess with them but just display them in more compact way.
I am more like a novice and hope for an easy solution, but if customization is required I may need to use the help of a professional web designer.