You can create sloping walls by giving an extra elevation to the wall corner points and changing the heights of the wall corner points.
Location of Corner Point Elevation Feature
You can access the corner point elevation feature from the Advanced tab of the Wall Settings dialog .
Enter the settings of the wall you want to change the corner point of elevations.
Set values for the corner elevations in the advanced settings tab.
Click the OK button to close the dialog.
Your wall will be updated according to the corner elevations you entered.
Area to create a garden wall
Before the walls are leveled at the corner points
Entering the value -15 on the upper left corner of the wall
Giving +15 value at the upper right corner of the wall