Hello.
I made an order and then realized I'd not pt all the products I'd like into said order.
Upon creating the second order, the options for 'Combine order' did nothing more than constantly shunt me back to the Paizo main page.
I now have one nice, large order and another order of a single item.
I have sent an e-mail to the customer service desk and am following friend's advice on posting the problem here.
Very best cheer to all.