Several users have asked how to subtract the area of openings (doors, windows) from surface area calculations for materials such as exterior siding, brick, drywall, or insulation. Although this request comes up often, the feature is already available in the software in several forms. Users can subtract these openings by drawing shapes over the main surface (the system will then ask if you want to subtract that area), by making a manual adjustment (subtraction in square feet) in the measurement details, or by using custom formulas that link the total area to the area of the openings.
