Infotype for fetching employee previous company details?

Hi Experts,

Iam new to the HR-ABAP,what is the infotype for employee previous company details here i want to display the employee previous company details.

In OM(ORGANISATIONAL MANAGEMENT)how to find the person is a employee or manager and if the person is managaer how to find employees under that manager and what are infotypes.

Please help me on this.

Thanks and Regards,

Venkat M.