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In this tutorial, you can learn How to convert the assembly to a solid model.
This video has been created based on a question from a comment under my video on YouTube channel. Feel free to contact me or leave a comment, or idea for another Creo tutorial.
If you add the hidden config intf3d_in_as_part yes you can also import a STEP assembly directly to a part without the need to save the assembly to Parasolid format from the imported assembly.