Pro adds its options to the same Box tab of each product.
Box sizes
One product with a size switch, for example Box of 6 for 29.90 and Box of 12 for 54.90. Each size has its own slots and price, which replace the size and price above. A link can pick a size: add ?wfbb_size= and the size id. Items already chosen stay when the shopper switches.
Discount tiers
Percent off by number of items, for example 5% at 6 items and 10% at 12. The progress bar shows the next reward. Tiers replace the full box discount.
Role prices and surcharges
A role rule sets a box price, or a percent off the box price, for a role such as wholesale. A surcharge adds an amount to a premium item, and in a fixed price box that item shows it with a plus sign.