Placing Slab into Site Archicad

[Bri Fullerton]

Does anyone know how I can place my slab into the site in Archicad? When I try to cut out part of the site for my slab, the slab still seems to be buried.

The site is imported from Rhino as an object. I am also unsure how to make my site a mesh rather than an object (or if that is necessary to do).

[Laszlo Nagy]

Is your site a Mesh element?

Does it have a 3D body or is it only the top surface of the Mesh? This is important because Solid Element Operations work only of elements with 3D bodies. They do not work on elements that only have surfaces that do not form a 3D body.