For 3 UP key tags on standard CR80 cards, you should just need to set the number of columns to 3 in the page setup of the card designer under the template tab.
This will then display a card the size of one of the tags for you to create the design.
Then from the main CardExchange Producer window you can select multiple records to be printed, and 3 different records will be printed on the same card (1 on each tag).
Hope that helps,
CardExchange Solutions Support Team
"If you define the problem correctly, you almost have the solution." (Steve Jobs)