Select the paragraph(s) you want to format
Go to the Home tab
In the Paragraph group, open the dialog box launcher (small arrow in the bottom-right of the Paragraph group)
Under Indentation, find Special
Select Hanging from the Special dropdown
Set the By value (e.g., 0.5″)
Click OK
Alternative method (Ruler)
Turn on the ruler (View tab → Ruler)
Select the paragraph(s)
Drag the bottom part of the left indent marker (hanging indent marker) to set the hanging position
Ensure the top part of the left indent marker (first-line indent) stays where you want it