Exporting Assemblies to Abaqus

Hi,

I am meshing some CAD files, containing different parts, and what I need to do is export these in the Abaqus file format.

In order to perform simulations, I need to export from HyperMesh the geometry grouped in parts and instanced in one Assembly, but unfortunately HyperMesh doesn't seem to allow this.

In fact, everytime I try, I get Abaqus files that contains only the nodes and the connectivity matrix without the description of parts and assemblies.

Help anyone?

Thanks in advance