Several contacts with one access level can be changed to another level together.
You may want to change the access levels for more than one contact at a time. And you may want to see which contacts have specific access levels. You can do both of these conveniently by changing your view of contacts from Contact List to Access Levels.
In Communicator 2007, click the Change view button . Then click Access Levels. You will see your contacts sorted by the levels you have assigned them. You can select several names by using the SHIFT or CTRL key. Then right-click any selected name, click Change Level of Access, and make the choice you prefer.