I want to get all users of manangers

When we create a user we have option to add a manager of user. So i need to get all users of specific manager. I can is logged in user is admin or not so is there any function i can check this is manager or not if yes then how i can get all users under specific manager

take a look here How to get the contact diagram?

No really directly in NC. You probably should look at IAM engines to get those kind of features.