Right-click on a Product Configuration file in the navigation tree and select New > Transform File.
In the first dropdown box, find the original PROXY Pro Installer (.msi) file corresponding to the type of Product Configuration file you selected in the left-hand navigation box (this should have been loaded in the first step of this process (see "Installation Files").
Input a filename for the new Windows Installer Transform file and click OK to create new Windows Installer Transform file.
The new Windows Installer Transform file will appear in the left-hand navigation under Installation File.
Note that configuration settings that have been changed will show new setting in the Value column and Default flag will be set to "No". Generally, customers create two tranform files (ex. Host32.mst & Host64.mst), one for each architecture.