# Expression

**YouTube:** [How to Configure and Use Expression Functions in Sale Bill?](https://www.youtube.com/watch?v=oOsuVpBZWEw)

## How to Configure and Use Expression Functions in Sale Bill?

In this tutorial, we’ll demonstrate how to **set default expressions for generating a sales bill** in **Logic ERP**, allowing fields like **Remarks** to populate automatically based on user-defined expressions.

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### **Access Sales Voucher Configuration**

* Open the **Sales Voucher Configuration** window.
* Select the **relevant billing series**.
* Under **"Other Settings - 1"**, click on **"Other Settings"**.
* Then navigate to **"Defaults - 2"**.
* Locate the option labeled: “**Expression”**.
  * Here, you can define **custom expressions** using the available field list.

<figure><img src="/files/lZKt0QnPUthXcSWOxhFb" alt=""><figcaption></figcaption></figure>

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### **Create a Default Expression**

* Let’s create a default expression for the **Remarks One** field.
* In the expression editor, combine fields such as:
  * **Transport Mode**
  * **Vehicle Number**

<figure><img src="/files/Y3jMEfnq5H9i0X9Xh5PI" alt=""><figcaption></figcaption></figure>

* Save the configuration after setting the expression.

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### Functionality in the Billing Process

* Navigate to the **Sale Bill** window.
* Enter the **Transport Mode** and **Vehicle Number** in Other Details Column.

<figure><img src="/files/RW9TdquuTgXQyPHSawMR" alt=""><figcaption></figcaption></figure>

* Proceed to **save the bill**.

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### Observe the Applied Changes

* Reopen the saved bill.
* Navigate to the **Other Details** section.
* Observe that the **Remarks One** field is **automatically populated** with the values entered for transport mode and vehicle number.

<figure><img src="/files/EssTaEUJg9QyuNwKYm2k" alt=""><figcaption></figcaption></figure>

***

### **Conclusion**

Using default expressions in Logic ERP allows for **automated data entry**, reducing manual effort and ensuring consistency across sales bills.


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