Hi matt, I'm glad that you're making use of MoI for modeling too!

> Maybe it could be a possibility to develop an add on that first looks into
> the structure of a STP file and you can select just sections of the file
> at a time to import and convert . . ? But then what do i know . .just
> a thought?

Unfortunately the details of dealing with STEP format are pretty darn complicated, so MoI's STEP import is handled for me by a library that I license - I'm not sure that right now that library is structured in such a way that it exposes that information of just structure alone and being able to selectively import. It's probably something that would need to be developed and added into that library first before MoI would be able to make use of it.

- Michael