How can I design a layer around area outline of a product body?

I have a product like fish and now I want to design a layer around area outline of its body, is it any feature or option in catia or solid so that I can use to add it to my product?
1 Answer

Ali; please don't post the same question twice. it's very confusing.
https://grabcad.com/questions/how-can-i-design-a-cover-for-my-product-via-catia