In order to share 2D and 3D archiCAD libraries, you must have an Object ARX enabled version of ADT (does such a thing exist?). If this is what you have, the object adapter can still be found on many manufacturer web sites such as the ones listed at
http://www.archicad.lap.hu/ (bottom left hand corner of the page).
If you don't have this, then you'll need ADT's 3rd party plug in for IFC and transfer the library objects that way.
For the first option, in the ArchiCAD translator, there is an option at the bottom to send ArchiCAD 'blocks' as GOA objects. This refers to using the Object adapter plug in referred to above.
My understanding is that the Object Adapter was effectively neutered when Autodesk dropped Object ARX.
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