If you are looking to create new Construction Types that do not already exist, then the answer is no, not within Revit MEP. From the full IES
you can do this.
There are hundreds of Wall Constructions in Revit MEP 2009, is there a particular construction you are not finding?
Cheers,
Kyle B
Revit MEP Product Manager
Kyle Bernhardt
Director
Building Design Strategy
Autodesk, Inc.