- Click
. - In the Options dialog box, click the MEP Elevations tab.
- Define the elevation:
If you want to… then… add an elevation click 
and specify the name, elevation, and description. edit an elevation select an elevation. Click in the name, elevation, or description field and edit the text. delete an elevation select an elevation and click 
.
You can define elevations to use for your systems during layout. You can create elevations for different systems on the same floor or for multiple floors in a single building. You can also manually enter elevations as you add parts, but using defined elevations maintains accuracy and saves time.
For example, if you want all air supply ducts on the first floor to have an elevation of 12'-0'', create an elevation of 12'-0'' with the name Supply - 1st Floor. You can select this elevation when adding duct in the drawing. All non-vertical duct segments and fittings in the run are automatically placed at 12'-0''.