The templates from webstyle or menu maker cannot be directly imported into Web Designer.
You can however import the individual vector objects used to create a template in Webstyle or Menu Maker into Web Designer.
The objects which makeup a template are saved with a .wix file extension and Web Designer supports the import of .wix files.
Your Menu Maker template files are located at C:\Program Files\Xara\Menu Maker\WSTemplates\Misc Navbars You can therefore drag and drop any files with a .wix extension from this location directly into Xara Web Designer. Alternatively, select file and import from Xara Web Designer and browse to this directory in order to select a particular wix file to import.
Similarly, webstyle .wix files are saved within the wstemplates folder of the webstyle installation folder (C:\Program Files\Xara\webstyle 4\WSTemplates\