This tool allows the user to change the size of an existing NES.
Go to the Floorplan in the top right corner or on the left global toolbar.
Select the NES on the left. Click "Show More" and select Resize
Choose the NES from the drop down list
Indicate how many feet you want to add (positive number) or subtract (negative number)
Either click and drag the corners of NES in the desired direction or type in the number of feet and inches or meters to resize by. (One recommendation is to click and drag first, and then update the entry boxes to whole numbers.)