Need Sales Order Back Order Qty in an Search

I've figured out how to get the qty ordered, qty fulfilled, and the available qty on hand by location for each line item on an open sales order Saved Search.  What I can't figure out is how to get the Back Ordered quantity (so the user does not have to do the math themselves, and would provide another column that could be filtered by for other purposes).  This field shows plain as day on the Sales Order form, and I can get this field in a Report, but how do I do it in a Search?

Simply subtracting the qty ordered from the qty fulfilled is all I need, and of course I can do this in Excel, but I want something that my staff can put on their Dashboards.  I don't know Netsuite formulas, so I'm thinking that's the route I may have to take (don't know SQL at all, which I understand is very similar to Netsuite's formula format).