When you import an IFC file, you can specify objects to import. For example, if you want to create a drawing file that displays only the curtain walls from the IFC file, you can clear all other objects listed in the IFC Import Options dialog box. When the drawing is viewed, the only objects included will be those that you selected.
Style names stored in the IFC file display on the Properties palette and in Style Manager. If there are no specific style names in the IFC file, style names are created incrementally, such as IFCSTYLE(0).
You can specify how and when styles are created if there are multiple styles with the same name in the IFC file. They can either display incrementally with a number suffix or display with the name first encountered, regardless of whether the styles are the same, during the import.