1. Begin by navigating to your settings.

2. Next, select the 'Custom Fields' section.

3. Proceed by clicking the 'Add Field' button.

4. Choose the 'Dropdown (Single)' option.

5. Move forward by clicking 'Next'.

6. Time to add your field name.

7. Input your preferred option name here.

8. Now, add another option by clicking 'Add an option'.

9. To remove an option, click the delete icon.

10. Open 'Additional Preferences' for more settings.

11. Customize your unique key here, if needed.

12. Time to add your field's description.

13. Select your object, for example 'Contact'.

14. Complete the process by saving your changes.
