Can we put a hierarchy of Project managers in Projects management for organization? And when?

Yes, but it all depends on organizations.

If you are talking about putting a "project management structure" within an organization, they yes,, it would be possible/feasible to build a hierarchy of project management positions/roles/people within this structure. 

1. Project Coordinators
2. Project Associate Managers 
3. Project Managers
4. Senior Project Managers
5. Project Director(s) 

SURE yes we can & when we are working in large , multiple  projects

Yes We can:-

Hierarchy of project managers in the organization project management is suitable for large projects 

Dear Rami, thank you for your invitation,my answer is Yes, once we have Mega-Projects.

Yes we can. Usually in companies where there are large projects are developed a certain hierarchy (topdown) is created as below,

1. Program Manager

2. Projects Director

3. Project Managers.

4. Project Coordinators

5. Model leaders

etc.