Instructions from the Video:
If you have the Commander turned on, it will display a Base Height edit box as soon as an insertion tool becomes active.
The value shown in the Base Height edit box is the height at which the element will insert in your drawing. Before inserting the element, you can change the insertion height by typing a value in the Base Height edit box and pressing TAB.
If the element is a building element, the height is measured from the floor level of the current building location to the element’s insertion point. If the element is a landscape element, the distance is measured from the terrain to the element’s insertion point. Most elements have their insertion point at the bottom of the element. Exceptions are windows and wall openings, in which the insertion point is located at the top of the element. In the case of windows and wall openings, the edit box reads “Head Height”.
Let’s look at a window as an example.
Select Insert>Windows or select the Windows icon under the Building tab.
Select a window from the catalog and move the cursor onto the drawings screen, In the Commander area, at the bottom of the screen, Head Height appears. The default is the head height value set in the Building Locations dialog box. If you are inserting the window into a dormer, the top of the window may need to sit higher than the standard head height value. Type a value in the box, you don’t need to move your cursor into it, it is automatically active, and then hit TAB on your keyboard. This will set the height so when you left click to insert the window it is inserted at that height.
Upon insertion, if an element should sit at a higher height remember to look in the Commander for Base Height or Head Height to insert it at the correct height. I hope that makes your work easier!