What function includes creating product assortments from several sources?

The correct answer is the logistical function. This function is primarily responsible for managing the physical movement of products and materials, as well as organizing various tasks related to the supply chain. Creating product assortments from multiple sources falls under this category because it involves gathering products from different suppliers and combining them to meet customer needs effectively.

The logistical function ensures that the right products are available at the right time and in the right quantities. It encompasses activities such as transportation, warehousing, and inventory management, all of which are crucial for creating a diverse range of product assortments that can appeal to different customer segments.

In contrast, while the transactional function involves the buying and selling processes, it does not focus on bundling products from various sources. The facilitating function pertains to services that enhance the buying experience, with no direct connection to product assortment creation. Finally, the customer service function mainly revolves around post-purchase support and customer satisfaction, rather than the logistics of product arrangement.