You need to install the Structural Synchronizer and the ISM Revit plugin.
Details about obtaining those installer here: How can I find the ISM installer?
Some tips about usage here: communities.bentley.com/.../7800.ism-revit-plug-in
You can also import or export IFC files from the Structural Synchronizer. I replied to your other post assuming you are trying to export IFC from STAAD.pro.
Posted this on the Structural Forum too, not sure the best spot to post....
Several Mapping Issues:
Can't seem to figure out how to get my composite decks and roof decks to map into Revit. They all come in as generic slabs. Should I be changing…