Autodesk Revit MEP

[#1]

Need answer for both 2011 and 2012 ACAD MEP.

Designers forgot to justify my duct at the top (2 projects) ... is there a quick way of re-justifying the ducts so they align from the TOP.  The design is currently center justified.

See http://wikihelp.autodesk.com/Revit/enu/2012/Help/R​evit_User's_Guide/0325-Build_th325/0794-MEP_Mode7... for similar to what I am looking to do ...!

Also, is there a way of LOCKING the height of the duct?  The menu allows locking the width, but not the height

[#2]

In Revit MEP, I don't believe that there is a quick way to modify mass ductwork as you described. You would have to modify each transitions' OffsetHeight. And regards to locking the height, you will have to use constraints, and it would probably be best to create a Reference Plane at the level of the top of the ductwork and then constrain the ductwork to that.