You can display multiple way points in your route direction by using WP Google Maps Plugin for WordPress.

Step 1 Click Add Route or Edit Route from WP Google Map plugin.

Step 2 Scroll down to the Way Point(s) section.

Step 3 Select the way points which you want to display in your map.

Select Way Points

Step 4 Click Save Route.You will see your assigned way points display in your created directions.

Map Way Points