How to keep field from populating with default numbers?

It's hard to describe my question so I've included a screenshot of what I'm working on. In the third column, there is a calculation in each field's properties to take the number from field to the extreme left of it (in middle column) and subtract the number filled in to the field at the very top (in middle column). Trying to figure out how to make the numbers in right column that have not yet been calculated from showing a default (the -$10,000). I'd rather it not show anything until the fields it's supposed to compute are filled in. Or even showing zeros would be better. Is there a workaround for this?
Thanks so much for your time and help!

You need to use a custom calculation script that checks first that both fields are filled in before applying the calculation. It can look something like this (of course, adjust the names of the fields in the first two rows to match the ones in your file):
var v1 = this.getField("Field1").valueAsString;
var v2 = this.getField("Field2").valueAsString;
if (v1=="" || v2=="") event.value = "";
else event.value = Number(v1) - Number(v2);

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