There is no such thing. Support for Photoshop Live 3D has been removed in CS6 due to technical incompatibility issues with PS' code and for anything else you need plug-ins.
If you have an older version of AE that still uses the Photoshop 3d import, look for tutorials on how to use it. There are dozens out there including some in the After Effects help document for your version.
However, this feature was pretty clunky and there are other, better ways out there (Element, etc.)