By James Philip
You can create a new duct or piping system type by duplicating an existing system type.
When you duplicate a system type, the new system type uses the same system classification. You can then modify the duplicate without affecting the original system type or its instances.
Creating a custom system type for duct.
In the Project Browser, expand Families Piping Systems Piping System.
Select the duplicate, right-click, and click Rename. Enter a name for the new system type.
In the following example, the High-Pressure Supply Air was created from the Supply Air system type and has the same system classification. See Fig 1.
Then edit the type properties as required. See Fig 2.