Like the order-level settings, these are all optional.
Minimum quantity
Customer must purchase more than this amount.
Maximum quantity
Customer must purchase less or equal to this amount.
Group of…
Customer must purchase a multiple of this amount.
Order rules: Do not count
Exclude orders from the counts of the above per-order rules.
Order rules: Exclude
Exclude from the per-order rules entirely.
Category rules
Exclude from category group-of-quantity rules.