Question : record selection formula in crystal reports

There must be an easier way to do what I am doing... I think my logic is all bad. Here is my current Record Selection Formula in a Report in Crystal Reports 10:

{customer_list.Bank Name} = {?Customer} and
{all_flood_certs.Date Invoiced} in {?startdate} to {?enddate} and
{all_flood_certs.GCE File} startswith {?Bank ID} and
ISNULL({all_flood_certs.Date Canceled}) and
{all_flood_certs.Flood Zone} <> "B" and
if {?ReportType} = "SPECIAL" then (
{all_flood_certs.Flood Zone} <> "X" and
{all_flood_certs.Flood Zone} <> "C"
)
else true and
ISNULL({all_flood_certs.Loan Retired})

Now... I need to add the ability for users to easily RE-INCLUDE some of these exclusions such as include Flood Zones=B and Loan Retired and Loan Canceled data that is NOT NULL.

Any pointers on how I should proceed with the logic would be greatly appreciated. Should I have a CASE statement?

Answer : record selection formula in crystal reports

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