If you want to use a set of formatting attributes for multiple topics, you can create a Topic Style from a topic that you've already formatted.
Format a topic with the attributes you want to use. These include the topic font, shape and color, alignment, size and margins, and subtopics layout.
On the Home tab or on the Format tab, in the Styles group, click the Topic Style arrow, and then click New Style From Selected Topic.
If the Topic Styles pane is already open, under Selected Topic, click New style from selected topic.
The new style will appear in the Topic Styles pane with a unique, generic name. You can rename, modify, or remove the style after it has been created.