Need help with Replace Metadata then multiple Save script

Question

I am attempting to create a javascript to run on a folder of PSDs. I need it to:
1. Replace image Metadata with an existing Metadata Template called "UsageTerms".
2. Play an existing Action "Prep_PrintRes". (The action sharpens and converts to 8-bit)
3. Append "_PrintRes" to the filename. (ie OriginalPSDName_PrintRes.jpg)
4. Save the file as a 12 Quality JPEG to specific folder on my hard drive, "D:/Transfer".
5. Play an existing Action "Prep_Magazine" (The action resizes, sharpens, and converts to CMYK)
6. Append "_Magazine" to the filename. (ie OriginalPSDName_Magazine.jpg)
7. Save the file as a 10 Quality JPEG WITH NO EMBEDDED PROFILE to "D:/Transfer".
8. Play an existing Action "Prep_Screen". (The action sizes, sharpens, and converts to sRGB)
9. Append "_ScreenRes" to the filename (ie OriginalPSDName_ScreenRes.jpg)
10. Save the file as an 8 Quality JPEG to "D:/Transfer"
If anyone is available to help me get started with this I would greatly appreciate it. I can do a minimal amount of Visual Basic but Javascript is alien to me. Thanks so much!

Answer 1

Try the following as the custom calculate script:
// Sum the field values, as numbers
var sum = +getField("LaborCost").value;
sum += +getField("MaterialCost").value;
sum += +getField("EquipmentCost").value;
// Set this field value
event.value = sum > 0 ? sum : 0;
For the other one, change the last line to:
event.value = sum < 0 ? sum : 0;