Organizing References by Category

You can assign each reference to one or more categories in order to group your sources by topic.

Switch to the Context tab.

Click Categories.

Select the checkbox in front of the categories you want to select. Close the window by clicking OK.

Alternatively:
Type the name of the category in the Categories field. Select one of the suggestions.

Alternatively:
On the View menu, click Show category column.

Drag the reference to the desired categories.