You can import parser rules from the file type settings of other files, from schema files and from other XML files. You can import them when you create an XML file type (in the Create File Type Wizard), or at any time later, using the Import button on the Parser Rules page.
To import the parser rules settings from other SDL Studio XML file type settings (files with extension .sdlftsettings), you need to import the whole set of file type settings for that file type. Select File type , rather than any one file type, so that all File Types are displayed, and click Import Settings.