Using Categories
Another way to group contacts, appointments, tasks and memos (summarized by the term "objects" in the following text) is to mark them as belonging to different categories. You can mark an object as being in several categories or no category at all. For example in your address book, you put a friend in the "Business" category because he works with you and the "Friends" category because he is a friend.
To display only the objects in a particular category, select the corresponding category in the quick search bar.
Setting categories for an object
To mark an object as belonging to a category,
Double-click the object to bring up the corresponding editor.
Click Categories…. (If this button is not available, select View ▸ Categories.)
从列表中选择列表。您可以选择您想要的任意多或任意少的类别。
Adding and managing categories
If the default list of categories does not suit your needs, you can add your own categories either directly via Edit ▸ Available Categories, or indirectly when editing an object:
Double-click any object to bring up the corresponding editor.
Click Categories…. (If this button is not available, select View ▸ Categories.)
在顶部输入框中输入新类别的名称。
Click OK.
You can now see the category in the Categories text field in the editor.
Click OK.
In the Categories Editor you can edit or set the color and icon for each category available by clicking Edit at the bottom of the Categories window. Press Delete to delete categories from the list.