General Motors Co. has created a new executive position overseeing the carmaker’s global strategy in areas such as urban mobility, car-sharing and ride-sharing services and autonomous vehicles. The automaker Tuesday confirmed that Mike Ableson was named vice president of strategy and global portfolio planning late last week. He will oversee an area of expected growth for the automaker that also includes connected cars with GM’s OnStar 4GLTE Wi-Fi capability, electric vehicles and fuel-cell vehicles.