No, Buyers cannot mix-and-match layers of different Brands' products on a pallet. Each pallet (and order) is tied to a single Brand. A Buyer can checkout with multiple Brands, but multiple orders will be created for each Brand present within the order. At the moment, Grovara does not offer consolidation on orders.
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How to place an order on the Grovara Marketplace
How to search the Grovara Marketplace