How can one place an object at a specified height in AECOsim building designer V8i?

I am fairly new at operating the software and would like help with some basic tasks. One such doubt is as follows:
I have imported an MEP drawing from AutoCAD and the ducts are placed at a particular height from the plan drawing. I would like to know how one specifies the height of the duct before placing it so that it coincides with the imported AutoCAD drawing. Thank you in advance.