Soft and hard copies of a single product in Drupal Commerce?
After some more experimenting I have worked it out. For any sort of product variations you need to edit the Product reference field. Change the field to a select list and also make sure the you set the number of values to unlimited (or at least more than 1). This will then create a drop down list which when changed will switch between the different products within the same node. I hope that this helps!