Use this procedure to convert mass elements to spaces. Depending on whether the converted mass element shape is an extrusion- type shape (box, cylinder, extrusion) or a non-extrusion-type shape (pyramid, gable, freeform, etc.), either an extruded 3D space or a 3D freeform space is generated by the conversion.
- Select the mass element to convert.
- Click
. 
- When prompted to erase the original geometry, press Enter to keep the mass element, or enter y (Yes) to erase it.