Raj,
External-The purpose of segment reporting is to make the profit and risk situation of individual enterprise areas (segments) transparentSegments in New GL Division of a company for which you can create financial statements for external reporting. In some accounting standards its mandatory to report financials segment wise such as US GAAP and IFRS etc.
T-codes
S_PL0_86000028-Financial Statement
S_PCO_36000218/9- Receivable/Payble by Segment
Internal-Market Segments in COPA
The aim of the system is to provide your sales, marketing, product management and corporate planning departments with information to support internal accounting and decision-making.
Profitability Analysis (CO-PA) enables you to evaluate market segments, which can be classified according to products, customers, orders or any combination of these, or strategic business units, such as sales organizations or business areas, with respect to your company's profit or contribution margin.
i hope it helps
Thanks
Hrusikesh