Hi! Need to have a checkbox subtract a text field value from the grand total of a calculation.

I have a total box at the bottom of the fees which has this calculation: value is the sum of "AdditionalService, GST 5, Locating, Optional Fee 1, Optional Fee 2, Phone Calls, Photocopies, Postage, Receiving, ServiceExecution"

Sorry for the delayed reply..today was the first chance I was able to test the above script. It worked brilliantly!!!!!! Thank you so much - i really appreciate it!!!!!!!!!!!!!!!!!!!!!!

Me again. Thanks so much for your assistance previously! Now i have a hit a little snag....

In my previous post i mentioned that these were the fields I have a total box at the bottom of the fees which has this calculation: value is the sum of "AdditionalService, GST 5, Locating, Optional Fee 1, Optional Fee 2, Phone Calls, Photocopies, Postage, Receiving, ServiceExecution"

I realized i forgot to include one field which originally was titled "x.  8566" which now i would like to change to "KM Total". This field has its own simplified field notation of TransportationFee*.8566

Using the script you provided above, i have tried to manually enter "KM Total" in between "Additional Service" and "Locating" but i can't get it to apply to the calculation and include it. Currently, it's showing all the appropriate fees except for adding in the KM total....what am i doing wrong?

Here is the script i have now entered: "KM Total is now added in"

var fields =["AdditionalService","KM Total", "Locating", "Optional Fee 1", "Optional Fee 2", "Phone Calls", "Photocopies", "Postage", "Receiving", "ServiceExecution"];

var total = 0;

for (var i in fields) {

    var f = this.getField(fields[i]);

    if (f==null) {

        console.println("Error! Can't find: " + fields[i]);

        continue;

    }

    total+=Number(f.value);

}

if (this.getField("GST Exempt").value=="Off") {

    total+=Number(this.getField("GST 5").value);

}

event.value = total;

This is what i'm getting in the JS Console

TypeError: f is null

1051:byteCodeTool