Edelski, the 15-year-old Swiss company that makes and sells Zai skis, has decided to stop manufacturing it at its own factory at Dissentis as of next March because of excessive costs. The company has already developed a line for the next season that will be made at another Swiss plant. Its new investors have put in more money to help the company diversify into other products such as clothing and golf equipment. The Dissentis site would concentrate on design and product development.