Account Management

Hi. Im the owner of a company. And I have 4 managers ( acting as the HR) to manage 6 different employees. Each one of them has no visibility of each staff’s salary and benefits. How do I create 1 main account with 4 different HR role? Im abit confuse and not quite clear with the user guide.
If i get it correctly, i add all 4 managers as HR first and then add the 6 employees under each one of them? Help