如何在MS CRM 4.0中设置层次结构

I need to setup hierarchies in MS CRM 4.0. I've below mentioned four levels of hierarchy.... Sales Agent -> Sales Manager -> Area Sales Manager -> Regional Office. Sales Agent guy is at lowest level of hierarchy and Regional Office is at highest level of hierarchy. Along with setting up these hierarchies, I need to implement data level security, that means.. One "Sales Manager" can see only the agents underneath him/her. One the same route, one "Area Sales Manager" can see only the "Sales Manager" and "Agents" underneath him/her, and one "Regional Office" can see only the "Area Sales Manager", "Sales Manager", "Agents" underneat that office only.I need to setup hierarchies in MS CRM 4.0. I've