"Show on Order Form" in WHMCS refers to the option to display a particular custom field or product attribute on the order form when a client is making a purchase.

For example, if you have a custom field like "Company Name" or "Additional Comments," you can choose to display it on the order form so that clients can provide this information during the ordering process.

Here are the steps to set a custom field to be shown on the order form in WHMCS:

1. Log into WHMCS:

   Access your WHMCS admin panel using your administrator credentials.

2. Navigate to Custom Fields:

   • Go to "Setup" in the top menu.
   • Click on "Custom Client Fields" for client-related fields or "Custom Fields" for product-related fields, depending on the type of field you want to configure.

3. Edit the Custom Field:

   • Locate the custom field you want to show on the order form and click on its name.

4. Configure the Field:

   • In the field details, you should find an option like "Show on Order Form" or similar.
   • Enable or select this option to indicate that you want to display this field on the order form.

5. Save Changes:

   • Click the "Save Changes" button to apply the setting.

By setting a custom field to be shown on the order form, you allow clients to provide specific information related to their order, which can be crucial for processing and fulfilling their requests accurately.

This functionality is especially useful for collecting additional details from clients during the ordering process, ensuring that you have all the necessary information to fulfill their orders effectively.