1. Create a formula to group based on your Fiscal Year.  For example, if your Fiscal Year was from 7/1 to 6/30, it might look like this:

if month({CnGf_1.CnGf_1_Date}) in 7 to 12 then "FY " + totext(year({CnGf_1.CnGf_1_Date})+1,0,"") else "FY " + totext(year({CnGf_1.CnGf_1_Date}),0,"")

2. Save and close the formula

3. Create a Cross-tab report that uses the formula from Step 1 as it's column