Define permissons for users or user groups to access certain sections

We are trying to break projects down by user and user groups. I can set group for each user but there is no way to define certain permissions for each user or group? i.e. what sections can be accessible, which reports or scheduled tests can be displayed, etc.
I would like to be able to define permissions for a group or specifically for a user.

Yes - this would be terrific!

@k_wang Thank you for your suggestion. I will add it to our team’s ideas tracker for our team to consider.