You can raise or lower an outdoor element using the Elevate tool.
To change the elevation of an exterior accessory:
Select the element.
Right-click and select Elevate, or select Edit > Modify Elements > Elevate. The value in the Elevate dialog is the current elevation of the element.
In the Elevate dialog, specify the desired elevation of the bottom of the element above the terrain or location (depending on which insertion option you used).
Click OK.