creo3 config.pro option documentation for: INTF_OUT_CAT_START_MODEL 
intf_out_cat_start_model
path to the CATIA .model start parts file
Controls the use of the attributes or parameters defined in the CATIA .model
custom or predefined start parts file when you export a part or assembly to CATIA.
When you specify the path to the CATIA model start parts file, Creo
parts and assemblies use the model parameter values defined in the CATIA .model start parts template files.
When you do not specify the path to the CATIA .model start parts file, the parts and assemblies use the default model parameter values.