IFC files can be imported. Geometry is converted to architectural objects where possible. Where not possible geometry is converted to grouped surfaces.
To enable IFC Data

1. Go to Tools and select IFC BIM Data. The IFC BIM Data dialog appears                                                                                                    
2. Check the Enable IFC BIM data.
3. Click OK.
4. This will open the IFC BIM Data dialog.

This dialog Allows you to view add or alter IFC BIM data as needed.

Clicking on some fields will present a Drop-down list.

Clicking on some fields will give you the option to Append or Remove a duplicate of the field

Clicking on all other fields will allow you to enter data directly.

The pages of the dialog are sorted using the tabs at the top, and the drop-down list below the tabs.

The Tabs are: Common, Persons, Organizations, Applications, Addresses. The contents of the drop-down alters depending on which tab is selected.
Here are all of the available pages:

Common

Persons

Organizations

Applications

Addresses

Click here to see the ISO Standard for IFC data

Building Storey

Object Data

Non-geometric data is mapped to custom properties for standard IFC data, and to Property Sets for expanded AEC data.