I have created a content-single-product page where the user is guided through 6 steps in choosing their custom product. I have created different actions for these steps. The first step is choosing a "main" product. The second step is choosing a fabric. I am using a simple nextgen gallery carousel to show all fabrics. When the user clicks on a thumb, I capture the pid of the image in a variable and a link to the next step appears. Now my question. How can I add this variable to the order (so show in checkout, cart and back-end order details) ?
Thanks in advance!