BUSY provides Transaction menu in which you can records financial transaction. Under transaction menu you will have option to record, modify and view list of sales, purchase, sales return, purchase return, payment, receipt, journal, contra, stock transfer etc.
To Add sale/ Purchase use respective head to add voucher, for expense entries you can use journal voucher.
For managing inventory in BUSY, it will provide stock journal, stock transfer, material issue to party and material receive from party vouchers