Spaces can be configured to include openings such as doors and windows. If you create spaces based on AEC objects in an AutoCAD Architecture 2023 toolset drawing, the spaces can automatically detect the openings.
Generated spaces are associative by default. They detect openings automatically, and cannot be manually edited unless you set them to be non-associative on the Properties palette. If you generate extruded 3D spaces using linework in a 2D floor plan, you have to set the spaces to be non-associative before you can add openings to the spaces.
Manually created spaces are not associative by default, and you can edit their surfaces and openings. For information on doing so, see About How Changing the Space Geometry Affects Surface Openings.
If you change a space from associative to non-associative or vice versa, existing openings are maintained in most cases. When you change a 3D free form space to a 3D extruded space, openings that do not intersect with the base profile of the extruded space are lost.