1.Yes, you can update the closing stock manual in balancesheet. Further, you need toconfigure for balance sheet stock updation by follow these steps:
Step 1: Go to administration section then configuration option
Step 2: Choose the features and option then select the accounts tab
Step 3: Select the manuallyin balance sheet stock updation.Afterward, you can update the stock manually in final result report.
2.In BUSY, you can post dual voucher such as sales, sales return, purchase, purchase return voucher in order to hit both accounting as well as inventoy.