See if this is what you are looking for:
You will probably also have to configure it for ap214 mode rather than the default 203.
Well, this gives me one STEP file of the Assembly.
I was hoping to get (2) STEP models of the (2) parts in the assembly.
So Given asm001.asm
With part001.prt & part002.prt in asm001.asm...
How can I get part001.stp and part002.stp
Isn't that what options separate_all_object or separate_parts_only in the step_export_ap214_asm_def_mode does?
You might also have to set step_export_format to ap214_is
Yep, it did. I set step_export_ap214_asm_def_mode to separate_all_objects
...and set step_export_format to ap214_is
...and Save-As step file produced: