You can raise or lower a window in a wall using the Elevate tool on the window’s right-click menu.
To raise or lower a window:
Select the window whose elevation you want to edit.
Right-click and select Elevate, or select Edit > Modify Elements > Elevate. The value currently shown in the Elevate dialog is the current elevation of the window top above the floor level.
In the Elevate dialog, specify the desired elevation of the top of the window above the floor.
Click OK.