Revit LT opens Industry Foundation Classes (IFC) based on the latest International Alliance for Interoperability (IAI) IFC 2x3 data exchange standard. (If you open a file that uses an earlier standard [IFC 2x or 2x2], Revit LT supports the format and opens it properly.)
When you open an IFC file, Revit LT creates a new file based on the default template. For information about selecting the default template, see Selecting a Template for IFC Files.
You can load your own IFC class mapping files and override the categories and subcategories for IFC objects.
To open an IFC file
Open
Revit LT creates a new file based on the default template.
To add IFC data to an existing project