You can define for each project a list of project managers.
These managers will have the right to approve all hours recorded by employees on their projects and see these in all available reports.

This comes in addition of our previous Manager role which has, for the occasion, been renamed as “Team Leader”.
To summer up, you have now two distinct manager roles: Project Manager & Team Leader

Here is a quick how-to:

Project Manager

In User Details, set the access rights of the employee to Project Manager.

In the project page, add the module Project Manager.

Then add the project manager(s).

You can as well go to the page of the person and add the module Project Manager.
Then add the people who manage this project.

Project Managers with projects, can only see their projects.
Project Managers without projects can see everything.

For more information about the module: Project Manager module documentation

Team Leader

In User Details, set the access rights to Team Leader.

In Is team leader of, add the people who belong to the team leader.

Team Leaders with a team, can only see their team.
Team Leaders without team can see everything.

For more information about the module: Team leaders & Org. Structure documentation

Team Leaders comes with more modules by default.
You can define what both types of manager can have with the module: Authorizations in Settings.