Redmine

I need this function:
I am administrator in my redmine application, but I need set project manager for some projects. And in this some project i need set rights, for this manager, create subprojects in this project. But this people cant see others projects, only his project and subprojects, so I can't set this manager administrator rights.

For exaple:
I have a project manager John and Peter. Petr developed projects in Delphi and john in PHP. I make two project and one assign Peter and second John. They can make subprojects in assigned projects, but Peter can't see project John and voice versa. I am administrator and I can see and administrate all.

Could you realize this function ?