What version are you using?
I can't remember the release where it was introduced into vanilla AutoCAD, but, try
-exporttoautocad or aectoacad
Melanie Stone
Facilities Data Management
IWMS / CAFM / CMMS / AutoCAD / Archibus / Tririga / Planon / MRI Manhattan CenterStone / Revit / data normalization, data mapping, reporting and process documentation
mistressofthedorkness.blogspot.com/