No, you cannot change the format of the Case Number which appears by default. However, you can hide the Case Number field (Auto Number field type) and create a custom field as per your requirements.
To hide fields
- Log in to Zoho CRM with Administrator's privilege.
- Click Setup > Customization > Modules.
- Select the desired module and click Layouts.
- In the Layouts page, drag and drop the field to the List of Unused Fields section.
- Click Save.
To add custom fields
- Log in to Zoho CRM with Administrator's privilege.
- Click Setup > Customization > Modules.
- Click the desired module. The Layout Editor will open.
- From the New Fields Tray on the left, drag and drop the required field type into the desired module section on the right.
- Name the field and define the Field Properties as required for the field.
- Click Save Layout.