Firm Job, Open Material Demand

I am trying to report on how much inventory I have VS how much I need for open Firm and Unfirm jobs.
The field in Part tracker (On Hand Warehouses) that shows Unfirm Job Demand seems pretty solid VS Time Phase… the rest of the Part Tracker demand fields seem less so. I am unsure what Total Demand Qty actually means. And Job Demand Qty seems to = Total Demand Qty. Where is “Remaining or Open Qty to be issued to Firm Jobs”. WilI have to calculate this?

Seem like there have been a few posts on this topic, sorry if I am redundant.