Observe the User Defined HVAC Fittings form

In Design-HVAC Designer Application and from the HVAC form select Category 'User Defined Fittings'.

The Specification created is displayed, and the selectors available to select the catalogue items. At the moment if you select any of these they will all be the same as the copied component /RSTHRE. So the next stage is to edit these components to be unique to match the initial requirements.