From a greater distance - You can inform or book a transfer by train
with Italian railways:
http://www.trenitalia.com
with Austrian railways:
http://www.bahn.at
with German railways:
http://www.bahn.de
Plan Your train trip with https://www.thetrainline.com/it
Once in region - You can inform regarding transfers by south-tyrolean integrated local transport system – or bus or train or cabinway- here: https://www.sad.it/de