import multiple models in a dxf but merged?

Discussion created by taowang on May 29, 2012
i have a dxf file containing several 3d building models which are independent objects in AutoCAD. But when i use 'load 3ds files' in 3D analyst, the resulted shape file contains only one grouped object.
i tried several versions of dxf, 'r12', '2000' and others.
i also tried direct 'add layer', 'quick import' in Interoperability module, which did not give any result.
Please find attached file.

does anyone have an idea on how to handle it?