in mac address book, i know you can drag names from one group to another. for example, if you want you Dr. to be in you "important" group and "personal"
It's pretty simple on creating groups in Address Book. The very left hand side of the Address Book window is the groups section. Click the plus sign at the bottom of the column and type in the name you want from the group. Then click the All at the top of the group column and then drag whichever contact you want in that specific group from the next column to the right of the group listing.
on a similar vain, I am trying to drag contact from Entourage 2008 to groups in address book. The little plus sign shows up, but the contacts don't seem to transfer. I don't want to use sync because it strips all the categories.
It turns out that command-X and command-V work to cut and paste contacts. I struggled with this switching over to a Mac, just tried it, and it works fine.