BOZEMAN, Mont. - Former Montana State standout Nico Harrison moved into an executive role within the NBA as the Dallas Mavericks announced his official hiring on Monday, as the organization's general manager and head of basketball operations.          Harrison was a 1,000-point scorer in three seasons at Montana State after transferring from Army. After a redshirt season, the future Bobcat Hall of Famer seamlessly moved into the starting lineup as the program embarked on one of its most successful three-year runs in history. Harrison led the Big Sky Conference in field goal percentage as a sophomore in 1993-94 with his clip of 62.4% still ranking among the top 10 single-season marks all-time at Montana State, according to a release.