Layers in Linked and Imported Files
When you import or link a CAD file to a Revit project, you can query, hide, delete, or change the graphic display of layers in the file.
Linking CAD Files to a Project
You can link CAD files to a project to use the drawings as underlays for project views or to place the drawings on sheets to include in the construction documentation set. Any changes to the linked CAD file are displayed in the Revit project.
Using IFC Files
You can use information from Industry Foundation Classes (IFC) files in Revit LT models.
Importing Images
You can import raster images to a project to use as background images or as visual aids needed during the creation of a model. You can also place imported images on sheets.