Possibility to modify the solid of Linked element

With this new command, you can modify your Linked element’s solid by making unions or subtractions with solids you create yourself. The size and mass of the element will be adjusted with the properties of the new solid. This can be very useful for adding landings to stairs. For stairs, you can also anchor your solids to either the top or bottom of the stairs. This means that if you anchor your landing to the top of the stairs and the height of the stairs is changed, the elevation of the landing will be adjusted accordingly.