Crystal Report Selection Formula

hi

check the fallowing steps

1. go to field explorer

2. Right Click on Formula fields--> new

you can see 3 small boxes

in the first box you can see report fields and db fields also. 

 give the formula as fallows

 

{CreditSalesBetweenDatesCustomerReport.TOTALAMOUNT}+{CreditSalesBetweenDatesCustomerReport.COURIER}+{CreditSalesBetweenDatesCustomerReport.PACKING}+{CreditSalesBetweenDatesCustomerReport.FREIGHT}