For Inventory management BUSY have sale purchase invoices option Stock Journal for stock generate and consumed, Physical stock Invoice management, Production Module for maintain stock of Production. Reporting portion of all transactions is also available where you can check opening, In-Out process of inventory and Closing balances of item.
For cost of goods sold sale invoice available you can check sale report by following below mention steps:-
Step 1:- Display Tab
Step 2:- Account Books
Step 3:- Account Registers (Standard)
Step 4:- Sale Register