Hi sneather, probably you'd want Trim curves with the "Model space" setting.
I'm not 100% sure what some of those other settings mean exactly like what in particular Alias means by a "hybrid model", that's some kind of terminology specific to Alias and not particularly a general STEP specific thing as far as I know.
Protocol type AP203 versus AP214 - either should work ok, but the 203 type contains only geometry and not any names or color information, that's stuff that has been added in by the 214 variant.
- Michael
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