total ke liye ye dale ok 

if {@TFoldMts} = 0 then
true
else
false


0 hatane ke liye jo fild hai uspe right click kro or formet feild me ja ke common me jake supress me jake ye peste kar do



and new act.mts ka new fild banane ke liye isme ye dale


iif({TBillItem.Amount}="",0,val({TBillItem.Meters}) - ((val({TBillItem.Meters}) * (100-val({TBillItem.Fold})))/100))