Youth Entrepreneurs has solidified another aspect of its national expansion plan. The Wichita-based and Koch Industries Inc.-backed nonprofit organization, which provides entrepreneurial and business education to high school students during a year-long class, is expanding with 18 new schools in its central region. Of that, 13 will be in new markets, including eight in the Dallas-Fort Worth area, four in southeast Kansas and one in Enid, Okla. Those additions will give YE 59 total schools in its...