套餐商品关联库存用法
<p>1.库存商品
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2.1， 建立个套餐-关联库存商品，价格为1
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3.前台销售兑换加一元送的时候，选择建立的套餐
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<h1>大小包装方法类似</h1>
<p>*实际库存为（小库存）
大库存为套餐
套餐 test =10 小库存
套餐 test售出 小库存-10</p>