The geometry from the file of IFC format can be imported as: Solids and T-FLEX CAD Operations. When you select T-FLEX CAD Operations the system tries to create T-FLEX CAD operations and the import will be slower.
Wireframe. Wireframe data will be imported.
Import model structure. Hierarchy of the source IFC file will be shown in the 3D Model tree.
Default units. Allows to specify units of the imported geometry in case that they were not specified in the source file.