You can make any text in Word look like a heading by using a large font size. How to Customize Word’s Built-In Heading Stylesīefore jumping to the tutorial, let’s discuss the importance of using Word’s heading styles.How to Create Headings Using Word’s Built-In Heading Styles.Or, do you want to add numbers to your headings? Check out “ How to Add and Modify Heading Numbers in Microsoft Word (PC & Mac).” Do you want to create your own custom heading styles separate from Word’s built-in styles? Check out “ How to Create a Custom Heading Style in Microsoft Word” and “ How to Create a Custom Heading Style in Microsoft Word for Mac.”