creo12 config.pro option documentation for: STEP_ADD_IMPORT_MODEL_TO_ASM

step_add_import_model_to_asm
yes
, no
*
Controls whether the imported model is assembled into a native Creo
assembly as its first component.
yes
- The imported model is created as the first component of a new Creo
assembly.
no
- The imported model is created as a top-level model in a new window.