Switzerland

The 08:05 train from Spiez to Milano Centrale - arrive 10:35, connect to the 11:05 from there to Torino Porta Susa arriving at 11:52 and Torino Porta Nuova at 12:05 should do the job. Both segments require mandatory reservations and for both portions the sooner you get your tickets the cheaper they are if you are willing to commit to non-changeable tickets. You can check other possibilities, and see more details, if you use the Bahn website for information and the SBB website and Trenitalia website for booking. You can do the whole trip, even from Interlaken with the SBB and collect your tickets on arrival in Switzerland. There may be special excursion tickets available for the entire journey. I know from nothing about buses, certainly nothing that crosses borders.

Joy, I believe that there are trains every other hour from Bern to Milano (they all stop in Spiez). You're going to have to change in Milano and/or Brig but its really easy at both stations. Without argue the best European train travel website I've found is sbb.ch (its the site of the Swiss railroad). Just put in any start and endpoint in any European country and it'll find you a train. Once you've found your possible trains you can also select "timetable booklet" and you can get a pdf of all possible connections to make your trip within the parameters you specify.

thank you for your great advice!!

"Without argue the best European train travel website I've found is sbb.ch (its the site of the Swiss railroad). Just put in any start and endpoint in any European country and it'll find you a train. Once you've found your possible trains you can also select "timetable booklet" and you can get a pdf of all possible connections to make your trip within the parameters you specify." Of course the SBB is the best ;-)