Select the heading text you want to format
Apply the formatting you want, such as font, size, color, and spacing
On the Home tab, right-click the heading style you want to save, such as Heading 1
Click Update Heading 1 to Match Selection
To create a new custom style, open the Styles pane
Click New Style or Create a Style
Name the style and set the formatting options
Click OK or Save
To reuse the saved style, select text and click the saved style in the Styles gallery