"border tickets"

Hi there
when i called the support phone line, they suggested that i purchase a border ticket because the specific train that we are geting on has to go through a country. example we are going from prague to venice but need to travel through Austria. So the rep told me to buy a border ticket. Can these border tickets be purchased online? or do i have to call the call centre for help/support? I need two border tickets. one for above trip. and the other when i travel from Munich to Krakow. We have purchased a five country select pass for france/germany/czech/benelux and Italy - just not for austria and poland as i was advised to purchase the 'border ticket'. more info on this would be great. Thanks.
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