When an IFC is imported and you choose the option ‘convert to construction elements, otherwise objects/morphs’, then new attributes will be created in ARCHICAD. If the imported content is an IFC structural file, the newly created attributes will consist mostly of complex profiles and Building Materials.
When placing a revised IFC model, it is good practice to remove the previously created attributes (e.g. complex profiles) However, if the project uses some of ARCHICAD’s standard steels (Options > Complex Profiles > Import Standard Steel Profile), the user might not necessarily know which are the imported IFC profiles and which are the ARCHICAD imported profiles.
36 profiles loaded into a project. When the IFC is imported, I can now easily see that anything after profile 36 is an IFC profile.
For structural imports, we recommend importing the .ifc converted to Morphs. For one thing, as an Architect you would not require the structural elements to be native. For another, the benefit of not having to manage attributes/libraries makes it easier to manage revised IFC models.