File menu > Import
Import loads or merges geometry files that are not gmax scene files. See the following procedure for a complete list of file types you can import.
Procedure
To import a file:
Choose File menu > Import.
Choose an import file type from the Files Of Type list in the file selector dialog. To see more than one file type at a time, choose the All Files file type.
Select a file to import.
For some file types, a second dialog appears, with options specific to that file type. Choose the import options you want.