Optional Material Charge is calculated automatically. Though optional, it is usually included unless the customer has supplied the plate. It can be deactivated by unchecking the line item's charge material checkbox.
How the Allocated Line Item Area is calculated depends on whether its a parts based quote, or nest based, and if nest based whether Nest+ was used.
The Raw Mat Sell then gets the material Discount or markup applied to determine the Mat Sell.
See Part Based vs Nest based Quoting and Part Based Quoting: Understanding Area Calculations
See here for more information on QFJ (Quote-From-Job).
Nest (Legacy) Allocated Area Calculation
Nest+ Allocated Area Calculation