Redmine

How to do the following?

In the Member setting page of a Project, instead of displaying all the non members of the project, I need to get only the list of users.

My need is to get a restricted list of non members of a project.

"a list of non members of projects but belong to groups of the members of the project and all its sub projects."

1. Find all members of project and its sub projects
2. Find all group of the above members
3. Find all users of the above groups
4. Find all non members of the project from the group.

This will help to prevent users of one department/company seeing the members and groups of another company/department

Thanks for the help
BL