## Zoho Inventory Documentation Index

Access the complete documentation index at:
https://www.zoho.com/en-fr/inventory/llms.txt

Use this file to discover all available documentation pages before proceeding.

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# How do I add custom fields to my orders, invoices and invoice payment receipts?

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To add custom fields:

*   Click the **Gear** icon on the top right corner.
*   Go to **Preferences** - _**Sales Orders**_.
*   Switch to the **Custom Fields** tab and click the **\+ New Custom Field** button on the top right corner.

![Screen shot of sales orders in preferences](/inventory/help/images/settings/pref-SO.png)

*   Give your custom field a proper name and select the data type.
*   Choose whether it has to be a mandatory field in that module.
*   Choose whether it has to appear on the PDF version of your transaction.

![New custom field popup](/inventory/help/images/settings/new-custom-field.png)

*   Click **Save** at the bottom to create the custom field.

> **Note:** You can create up to 44 custom fields for a module. However, there is a limit to the number of custom fields you can add for each data type. Click [here](/inventory/help/settings/preferences.html#custom-field-limits) to know the limitations.

Likewise, you can add custom fields to all the other modules.