How do you insert a "prior period" in Crystal Reports 2008

I am constructing a income statement that compares this current period versus the same period from last year. I used the parameter field and filter list for one time period. Is it possible to have a comparison time period on the same report.

For example Revenue and Expense amounts for the 2nd Qtr of 2010 and on the same report on the next column 2nd Qtr Revenue and Expenses for the 2nd Qtr of 2009?

Thanks for any help

jim