Cristina,
The revised one I uploaded here has a new report, rptExpediturePreviousCurrent, and after you enter the biginning and ending dates on Reports Menu, click the new button at the bottom.
What you should take a close look at is the union query, qryExpenditure_EU_PreviousCurrent, and then qryExpenditureSubTotal_EU_PreviousCurrent, which is the data source for the new report.
The key trick here is how to combine Previous Total and Current Total, and the answer is a union query.
Good luck.
Shoji