您可以拥有一个针"产品，并将其数量增量"设置为100.然后，如果有人想要700针，他们只需订购700针即可.工作人员将负责挑选500个装箱和100个装箱中的两个.这将使折扣成为可能，但不允许使用不同的SKU，因此库存控制将很困难.

You could have a single "needles" product and set it's "Qty Increments" to 100. Then if someone wanted, say, 700 needles they just order 700 and the staff would be responsible for picking out a box of 500 and two of 100. That would make the discount possible but wouldn't allow for different SKUs so stock control would be difficult.