We can add additional information to our model to display on Isogen called an Isogen supplemental. 


On the CADWorx Plant I ribbon on the Isogen section of the ribbon we have Isogen Supplemental.



Here we can apply instrumentation, penetrations (floor/wall), Flow Arrows, and Tie In's.



The only thing to keep in mind is a Supplemental will not route in the Z axis.  The following example will be how to place a 2-level instrument.


First I will place a North UCS at the location I will placing my Instrument.


Then I will route the Instrument up from the THRD valve assembly and put in my values.



The follow isometric is the output from Isogen and my current style settings.