---
title: "How can I make a custom field mandatory on the Job Booking screen and change a custom field from a text box to a dropdown?"
slug: "how-can-i-make-a-custom-field-mandatory-on-the-job-booking-screen"
updated: 2026-10-15T01:34:00Z
published: 2026-10-15T01:34:00Z
canonical: "help.servicetitan.com/how-can-i-make-a-custom-field-mandatory-on-the-job-booking-screen"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.servicetitan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How can I make a custom field mandatory on the Job Booking screen and change a custom field from a text box to a dropdown?

## Problem

Custom fields need to be mandatory on the *Job Boking* screen. Text fields need to become dropdown menus. Project numbers need to start at a specific number instead of default values.

## Solution

Follow the steps below to solve the issue.

### Make a custom field mandatory

1. Go to the top toolbar and click **Settings** ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/how-can-i-make-a-custom-field-mandatory-on-the-job-booking-screen-and-change-a-custom-field-from-a-text-box-to-a-dropdown-image-35nkbnpc.png?sv=2026-02-06&spr=https&st=2026-10-31T02%3A39%3A41Z&se=2026-10-31T03%3A39%3A41Z&sr=c&sp=r&sig=1attUxTCq25gmEDgdKH4IPJNtekk1%2BWMlp45sVXCDT8%3D).
2. In the side panel, click **Operations > Custom Fields**.
3. Find your custom field for the *Call booking* screen and click **Edit**.
4. Select **make this a required field**. ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/how-can-i-make-a-custom-field-mandatory-on-the-job-booking-screen-and-change-a-custom-field-from-a-text-box-to-a-dropdown-image-kshjw7ks.png?sv=2026-02-06&spr=https&st=2026-10-31T02%3A39%3A41Z&se=2026-10-31T03%3A39%3A41Z&sr=c&sp=r&sig=1attUxTCq25gmEDgdKH4IPJNtekk1%2BWMlp45sVXCDT8%3D)
5. Save your changes.

### Change a text field to a dropdown

You can't change an existing text field to a dropdown. This prevents errors with existing data.

1. Go to the top toolbar and click **Settings** ![](https://cdn.document360.io/961862ab-d0f2-4d91-bb62-a62ee8184eff/Images/Documentation/how-can-i-make-a-custom-field-mandatory-on-the-job-booking-screen-and-change-a-custom-field-from-a-text-box-to-a-dropdown-image-u97kdiot.png?sv=2026-02-06&spr=https&st=2026-10-31T02%3A39%3A41Z&se=2026-10-31T03%3A39%3A41Z&sr=c&sp=r&sig=1attUxTCq25gmEDgdKH4IPJNtekk1%2BWMlp45sVXCDT8%3D).
2. In the side panel, click **Operations > Custom Fields**.
3. Click **Add**.
4. Name the new field the same as your old field.
5. Select **Dropdown** as the field type.
6. Add your dropdown options.
7. Save the new custom field. For more, see [Add custom fields](/construction/docs/use-custom-fields).
8. [Deactivate](/construction/docs/use-custom-fields#manage-custom-fields) the old text field.