You want to actually hide the field, or just not show the "0" value?
If the latter then simply enter this code as its custom validation script:
if (event.value==0) event.value = "";
How would I show/hide the fields? Your script works to not show the "0". But, I'd like to show the field when the ST fields are populated, when not, then to hide the TotalST field. Can that be done?
Sure. Use this code instead of the one above:
event.target.display = (event.value==0) ? display.hidden : display.visible;
Works great!! Thank you