Add Friends to Private Category

1) Select friends you want to add to a private category and select [Friend] > [Add to] from the menu (A). You can also right click in friend list and select [Add to]. List of all categories appears (B). Only the categories to which you can add selected friends are highlighted and selectable. In the example below, three friends are selected in Private Category "Coworkers" and are added to Private Category "Local Community".

2) Three friends are added to Private Category "Local Community".