根据我搜索的资料，这个没有明确定义。
譬如中文版《竞争战略》把这个词翻译为”拉力促销“。
根据我的研究，目前最合理的解释是这个：
Pull through exists when the buyer’s customers “pull” (demand) a product or service through the buyer. Pull through usually requires a strong brand, and can only exist when there are intermediaries between the branding industry and the consumer.Consider the breakfast cereal industry in which major grocery chains are animportant buyer. The grocery stores must carry major brands (e.g., Kellogg’s)because end consumers demand these brands. This pull-through reduces thebargaining power of grocery retailers because they cannot threaten to stop carrying.