Line managers have line authority. Line manager is a manager who is authorized to direct the work of co-ordinates and responsible for accomplishing the organization’s tasks.
In popular usage, managers associate line managers with managing functions (like sales or production) that are crucial for the company survival.
Line manager is the executive involved with the functions of production, financing, or marketing.
Authorized to direct the work of subordinates-they're always someone's boss. In addition, line managers are in charge of accomplishing the organization's basic goals.