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Classify which domain it is included.
Inventory management system and billing, stock management falls in which software testing domain?
I'm not sure what you mean by "software testing domain", but for functional domains inventory and stock management generally fall under Logistics Execution and billing generally falls under Accounts Receivable.
Depending on your project, SUT, and processes, you may find that LE sits under either Warehouse Distribution or Manufacturing/Operations, and A/R may sit under either Sales or Finance.