How to bulk update Resource access provided to Users in Primavera EPPM Web?

Hi,

I'm on Primavera EPPM 16.1.6 - Web. I was trying to update the Resource access provisioned to multiple Users in Primavera & wanted to know if there is an easier way to do it..

Background:

When we earlier had only one Resource organization using this instance/DB for Project management, we had given 'All Resource' access to all Resource managers & Project managers. Now, we have other orgs starting to use this DB & we would like to restrict the Users' Resource access to their corresponding hierarchy.

Where I'm struck:

For the new Users that I imported, this was easy. I created one User with default module access & Resource access; then copied preferences from this user while I imported all others.