Do you sell seat reservations for Swiss Travel Pass, InterRail and Eurail passes?

If you hold a Swiss Travel Pass, InterRail pass or Eurail pass then you do not need to purchase full tickets; you only require a seat reservation where these are compulsory (most high-speed trains, panoramic trains, and night trains). Unfortunately, Rail Europe does not currently sell seat reservations without tickets, which means that you will need to use another website to buy your reservations or buy them locally at the ticket window.