Hi, Lynn,
Look in the online Help 'index' under Formulas. There is an entire section on multiple years complete with examples.
For example, if the .ColSpec data token is Y, entering {1} immediately before the Y, will return the amount one year ago. You can go back 9 years and forward one year (eg. {-1}. It's important you use the squiggle brackets.
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Regards,
Softrak Tech Support