Click the Project or Topics tab.
Select the topics.
To select a continuous block of topics, click the first topic, press and hold SHIFT, and then click the last topic you want to include.
To select non-adjacent topics, press and hold CTRL while you click each one.
Click Properties
.
Click the Appearance tab.
From Style Sheet, select the name of the style sheet you want to assign to the topics.
Click OK. The style sheet is linked to the selected topics.