# Generate Lot Numbers
**YouTube:** [How to Generate Lot/ Batch Numbers for Multiple Items Simultaneously?](https://www.youtube.com/watch?v=XxTt86JI5mU)
## How to Generate Lot/ Batch Numbers for Multiple Items Simultaneously?
In this tutorial, we will learn how to **generate Lot (Batch) Numbers** for selected items as well as for items that **do not currently have any lot assigned** in **Logic ERP**. This feature helps ensure accurate lot-wise inventory tracking across godowns.
***
### Open Generate Lot Numbers Module
* Navigate to the **Main Menu**
* Open the **Inventory** module
* Click on **Generate Lot Numbers**
***
### Understand Lot Creation Options
Lot numbers can be created in two ways:
* **Directly during Purchase Voucher entry**, or
* From the **Generate Lot Numbers** window (covered in this tutorial)
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### Create Lot for Selected Items
* Enter the **Lot / Batch Number**
* Choose the creation type:
* **For Specific Items**
* **For Selected Sale Order Items**
* Select the required **Items** from the search list
* Choose the appropriate **Godown** from the dropdown
> This ensures that stock is correctly maintained **lot-wise** in the selected godown.
* Click **Create Lot Numbers** to complete the process
***
### Auto-Generate Lots for Items Without Lot
* Use the option **Generate Lot for Items Without Lot**
* This option:
* Automatically creates lot numbers
* Does **not require manual item or sale order selection**
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### Verify Lot Creation
* Open a **Purchase Voucher**
* Create a new purchase entry for the item whose lot was generated
* Observe that:
* The **Lot Selection window** automatically displays the newly created lot
* The lot is shown under the **specified Godown**
***
### Additional Learning
To understand:
* [Creating lots for different business scenarios](/logic-erp-learning-hub-tutorials-and-best-practices/setups/configurations/purchase-voucher-configurations/other-settings-2/lot-no-as.md#how-to-configure-lot-numbers-in-purchase-for-various-business-scenarios-in-logic-erp-software)
* [Setting a **default Lot Number**](/logic-erp-learning-hub-tutorials-and-best-practices/setups/configurations/purchase-voucher-configurations/other-settings-2/default-lot-number.md#how-to-set-the-default-lot-number-in-purchase)
You can refer to the **tutorial links provided below** in the system.
***
### Conclusion
Generating lot numbers helps ensure:
* Accurate batch-wise stock tracking
* Better inventory control across godowns
* Seamless lot selection during purchase and sales transactions
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