As a wholesale partner, you're welcome to include an internal order number for each print and or frame in your cart. This can be the number order number given to your customer via your online store (recommended) or any number you choose. This is a reference field for you to be able to easily look up and locate the order in your order history.
For an order with multiple frames, add a number at the beginning to designate between frames in a singular order.
You will be promoted to input an internal order at checkout (screenshot below). This option is only available if you are logged in to your SF account: