> For the complete documentation index, see [llms.txt](https://kb.logicerp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.logicerp.com/logic-erp-version-release-notes/may-2025/inventory/assembling-lot-number-configuration-manual-and-expression.md).

# Assembling: LOT Number Configuration – Manual and Expression

A new update in Logic ERP introduces the ability to generate LOT numbers automatically using either the Manual method or Expression-based logic.

This option allows users to generate LOT numbers using either the **Manual** method or **Expression**-based in logic ERP. It guides you through enabling the feature and implementing it effectively within the assembling processes.

**Step 1: Configuring LOT Number Generation:**

* Navigate to Inventory > Assembling and then
* Click on Configuration.
* Locate the option **“LOT Number As”.**
* Choose the appropriate option: either **Manual** or **Expression**, based on your requirement.

<figure><img src="https://www.logicerp.com/tutorials/wp-content/uploads/2025/05/Configuration-Setup-Assembling-1.png" alt=""><figcaption></figcaption></figure>

**Step 2:** Let’s now implement both options one by one.

When you select Manual, the software gives you the option to enter the LOT number manually in the Assembling window.

<figure><img src="https://www.logicerp.com/tutorials/wp-content/uploads/2025/05/Manual-LOT-Number.png" alt=""><figcaption></figcaption></figure>

When you select **Expression**, the software provides some predefined fields that you can use to automatically generate the LOT number.

<figure><img src="https://www.logicerp.com/tutorials/wp-content/uploads/2025/05/Expression-LOT-Number.png" alt=""><figcaption></figcaption></figure>

Let’s create a sale bill to check this functionality.

<figure><img src="https://www.logicerp.com/tutorials/wp-content/uploads/2025/05/Expression-LOT-Number-in-billing.png" alt=""><figcaption></figcaption></figure>


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