If your cake layers are just slightly domed, you can likely use them as is. But if the rise is significant enough to affect how the cakes will stack, you can trim off the domed portion. Use a long serrated knife and a slow, sawing motion, and try to trim off as little as possible. In the future, prevent domed cakes by using cake pans with higher sides. The 3-inch depth on these cake pans works very well.