You can save reduced models to file as COMSOL Reduced Model files, which are variants of the normal COMSOL Model MPH-files but with a reduced model and the extension .mphrom. To import such COMSOL Reduced Model files, right-click the Reduced-Order Modeling node and choose Reduced Models Import, or choose it from the Reduced-Order Modeling menu on the Physics toolbar. A Select File dialog box then appears, and you can browse and choose a COMSOL Reduced Model (*.mphrom) model from the file system.

If you want to clear any reduced-order models from the model, right-click the Reduced-Order Modeling node and choose Clear Reduced-Order Models, or choose it from the Reduced-Order Modeling menu on the Physics toolbar