On the Box-Office page on Line-Up and by choosing the Products tab.
NOTE - You'll need to make sure the Box Office channel has access on the Visibility page of the Product.
Go to the Box Office page and select which Channel and Purchase Flow you'd like to sell product through
Click the Products tab
3. Add your Product(s) to the basket and go through the Box Office booking flow to put through your order
NOTE - If you can't see your Product or the price has not appeared, this might be because you haven't granted the correct Channel access or it has been unlinked to that performance)