To import an ADS .mdif file, select Sonnet ⇒ Utilities ⇒ Import Mdif File from the layout menu. A browse window appears on your display that allows you to locate the Mdif file you wish to import. You may import a file with up to 20 ports.
This utility allows you to quickly switch between your designs in ADS which have been translated to Sonnet. Select Sonnet ⇒ Utilities ⇒ Open Translated Design from the main menu of the ADS layout window. A browse window appears which allows you to select the desired design. The selected design is opened in the layout window.