Go to inventory and create any transfer order, now click on Mark as Todo. On click Mark as Todo button, There is one button will automatically activated Assign Series. Click on the button to redirect to import lot/serial screen.

It is very useful feature to validate fields and you can select columns to map with selected field.

You can see, imported lot numbers automatically added to product lines

The main feature that you can import any serial/lot number which are new or used etc. The system will not give you error but it will automatically detect that lot/serial is exist or not. If exist for same product then it will automatically set existing lot/serial.

You can use CSV or Excel file to import lot/serial numbers