If im understanding you correctly you want to have your users automatically logged in but you want you content to only be viewed by a certian group of people. The easiest solution for this is to create a new user group and add the approved users to that group. When you create the content you will set permissions on the page/content to only allow it to be viewable by that group. I'm doing something very similar. You can use the same portal but have content that vp's see and separate content that Regular Employees see for example. You will see both as the Admin but when they login they will only see the desired content for thier group. Hope this helps if you need further explanation let me know and I'll try to assist.