I believe the easiest way is to use the Advanced Steel 2015.1 Object enabler.
Have a look here:- http://knowledge.autodesk.com/support/autocad/learn-explore/caas/video/youtube/watch-v-xgP0Q3X-GV0-feature-youtube-gdata.html
Hope this works in your case.
Thanks for the reply, I exploded it to ACIS in the end.
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