Add Members to a Group Manually

I am on 3.2.1 wordpress and 1.5.1 buddypress and I am trying to find a way to manually add people to a main group. If I can automate that is great, but I have to find a way to get everyone in one group or it is going to cause me major issues. Any thoughts?

I looked at this, but given it says up to 3.1 and the changes made at 3.1 it concerns me to try -

Unfortunately I do not have a test site for my main site yet, so I am fearful of trying this without testing. Any help would be greatly appreciated.

Thanks, David