Hey Guys! So I'm an Intern at an engineering firm and my boss gave me a small project on solid works. I was given a model part of a sea shell. You know how seashells have growth rings around them? He wants me to add them on and I've tried everything I know including a sweep cut. The reason why I find it difficult is because it's awkwardly shaped and I can't find a tool to do it. Any help would be great.