brotherton-erpnext/erpnext/docs/user/manual/en/stock/articles/using-batch-feature-in-stock-entry.md

Using Batch feature in Stock Entry.

1. You need to first create an Item Master Record. You can do so by typing 'new Item' in the Awesome bar.
2. In the Item Master fill in all item related details. In the 'Inventory' section select 'Has Batch No.' as 'YES' NOTE: This option can be changed after submit but only as long as there are no Stock Entries created against that Item. Once an Stock Entry is created against that item this field freezes. To modify it again you need to cancel all outstanding 'Stock Entries'
3. You can then create a batch. To do so you can type 'new Batch' in the Awesome bar.
4. Fill in the batch related details and save the Doc.
5. Now in Stock Transaction You can associate a batch against that item under the 'Serial No / Batch' Section.