creo4 config.pro option documentation for: EXPLODE_IGES_DIMENSION_NOTE 
explode_iges_dimension_note
yes
, no
*
Controls the display of dimensions when importing an IGES drawing file.
yes
- Explodes each IGES dimension into two entities. An independent note contains the dimension text and another dimension with an empty note.
no
- Treats dimensions as in the original file.