video1.0<iframe src="https://www.loom.com/embed/533f2bd25b0e438099fd6098b7e000ba" frameborder="0" width="1728" height="1296" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>12961728Loomhttps://www.loom.com12961728https://cdn.loom.com/sessions/thumbnails/533f2bd25b0e438099fd6098b7e000ba-6c593a1edea83aa3.gif272.009I set up a mock scenario to explain how I track negative add and deduct changes using one assembly. In the example, the original footing and slab are the base estimate, and the overlay scenario captures the corner cutout by making the removed footing negative and the new footing and floor areas positive. The net change comes out to 53 feet for footing and 82 square feet for the floor, even though the raw floor add is 280 square feet. This helps track what actually changed without multiple assemblies. No specific action was requested from viewers.