Fittings from the active project workspace are added to the design using Place Fitting on the Pipe Run tab.
Place Fitting
For consumed fittings in a tube and pipe run assembly, click to highlight the fitting in the Model browser or the graphics window. Then click Place Fitting to place more occurrences of the highlighted fitting quickly. Using the Model browser, you can insert any compatible fitting from another pipe run into the target pipe run. Using the graphics window, you can only select fittings within the target pipe run.