How to maintain groups and layers in .dwg exported files

[giorgio78]

Can anyone help me with any usefull tip how to mantain groups and layers in files that are exported from .skp to .dwg.
Are there any special settings in SketcUp before exporting?

Thanks in advance for the answers.

[jonous]

Export as a 3d model dwg, not 2D graphic.

[giorgio78]

Thank you for the answer''jonous''.
The problem to me occurs when there are two groups touching each other as then comes to interruptions in exported .dwg file.