Step 1) Go to Master > Environment settings > Select Bar code
Step 2) In Barcode you can select the Sales Entry , Purchase Entry or Both.
Step 3) After that go to Reports > Stock Statements > Barcode.
Step 4) You can Print Barcode labels from the Barcode report.
Step 5) Go to Select option and then select the Based on SKU , Product Code and Serial No.
Step 6) After that select Product and then Press Ok and then print Barcode.
Step 7) And during the sales and purchase entry you can scan and use Barcode.