creo4 config.pro option documentation for: INTF2D_IN_IGES_SYMBOLS 
intf2d_in_iges_symbols
yes
*
, no
Controls the import of IGES symbols as entities or as symbols.
yes
- Imports IGES symbols as symbols. The Import symbols as entities
check box in the Import IGES
dialog box is not selected by default.
no
- Imports IGES symbols as entities. The Import symbols as entities
check box in the Import IGES
dialog box is selected by default.