InfoPath Dev

Okay so here is the setup and question that I have.

I am working on a expense report form and I have the following fields:  "Total Expenses", "Less Company Paid", Less Travel Advance", "Less Personal Expense", "Due to Employee", and "Due From Employee".  In the "Due to Employee" field I want to take the "Total Expenses" - "Less Company Paid" - "Less Travel Advance" - "Less Personal Expense".  Simple enough, I have that figured out but now here is the tricky part I need the field to only put a total in if it is greater than 0, if not then just 0.  I have tried rules and cant figure out what else to do.  Can someone help?

What about adding one more field to the data source - called Subtotal (or something that makes sense to you). It doesn't have to show on the form - just add it to the data source. It's default value could be the formula you have above -  "Total Expenses" - "Less Company Paid" - "Less Travel Advance" - "Less Personal Expense".

Then, put a rule on this field - that when it changes, if the value is greater than zero, set your Due To Employee field to its value, otherwise, set the Due To Employee to 0.

I'm attaching a simple sample form - save it locally, and right click and select Design to open in design mode. Then you can take a look and try it out in preview.

That worked perfectly......I can't tell you how much I appreciate the help.