How to write data to Physical STEP file

Hi Bros, I try to write some data to physical STEP file, just like:
write "233" to the entity in step file:
#17 = ADVANCED_FACE('',(#18),#32,.F.);
then get:
#17 = ADVANCED_FACE('233',(#18),#32,.F.);

I try to do this through "RWStepShape_RWAdvancedFace", but I don't know how to get the arguments.
Can you give me some advices.
Bless you.