In making a 2-tier cake, one 6" and one 8", how tall are your cakes? I like tall cakes and when I make a small 6-inch cake and I cut it in half and put a layer of filling, it isn't as tall as I'd like; should I use two full 6 inch cakes and put a layer of filling between those and call it 1 tier 6" inch cake? But then how many servings? I have an order for a two-tier cake to feed 25.
I also need a 3-tier cake - to feed appr 50-60.
When you cut a single layer in half you are merely torting it and it won't be as tall. I do that when I don't want a full tier. Or I will tort each cake to make 4 layers. Most tiered cakes are layer cakes that have been stacked on top of each other (and doweled of course).