Adding line numbers to documents is the easiest way to guide users through complex, lengthy documents. For example, instead of pointing out that some relevant information is near the middle of the third paragraph, you can instead refer to the specific line, making it easier to find. Line numbers are especially useful for referendums and legal documents.
When you add line numbers in Word, the numbers are displayed in the left margin of the document. If there are columns in the document, the numbers appear to the left of each column.
Click the Layout tab on the ribbon.
Click the Line Numbers button.
A menu appears with a few options for adding line numbers.
None: Removes line numbering in the document.
Continuous: Adds continuous line numbering throughout the document.
Restart Each Page: Restarts numbering at the beginning of every page.
Restart Each Section: Restarts numbering at the beginning of every section.
Suppress for Current Section: Removes line numbering for the current section.