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you can try the defeature tool before saving as step/parasolid - depending on the details of your assembly it can be simple or more difficult to hide what you want to hide.
Bingo! I had used Defeature before but did not actually follow through with all the steps. I performed the 'show preview' in which it deleted the internal parts but it did not show a solid body. Actually following the entire process through did get me to where I needed to be. Thanks.
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