Groups and Group Types

In my application, there are three columns for each user in the default Group; Name, Details, and Member Type.

I would like to add additional fields for users so that we can separate them based on their roles and grant them different access. 

Is there a way to add additional fields to the user groups? I tried to do some research into this and it seems like Group Types are the way to go but I am unable to figure out how to set it up. Specifically, I want to add something like these fields to the user table. 

<Name>   <Region>  <Country>  <Department> 

Do I create a Group Type for each new column? How do I add the values for each field so it can be a drop down list?

Thanks.