You probably haven't received any replies because your question doesn't give any clue about what software you are using.
Having said that, many systems have a field tied to a product (called a "switch") that can be set ON or OFF to handle things like discounts.
And then there's me ... I started programming in COBOL in 1967 ... using coding sheets and cards/keypunches, then moving on through online/mainframe coding, CICS, up through Microfocus COBOL, etc.
Sprinkled throughout the years were programs written in C, Fortran, DataBus, Assemblers (many...
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