Hello @Sowmya V
Welcome to the community!!
In order to add more options to the already created, you need to navigate to the custom fields, click on the 3 dots on the right-hand side of the screen for the required custom field and select the option 'Contexts and default value'. From the screen, click on edit options to add, remove or update the options.
Please note that this change will impact all screens which are using these fields.
Kindly accept the answer if this helps resolve the concern.
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