Multi-layer cakes have shelves. Punch the cake while making it layer by layer. Put it on the shelf. Then put it in a box, preferably a box with partitions, and one can put two floors. If there are eight layers of cakes, there are four boxes. And then sent to the venue, layer by layer connected by shelves to form a multi-layer cake. Many small shops deliver goods directly by private cars, packed in cake boxes, and have no boxes.