Possible Duplicate -
Please see the below links
More info here -
https://confluence.atlassian.com/jirakb/list-of-supported-custom-fields-for-request-types-in-jira-service-desk-customer-portals-867182673.html
https://community.atlassian.com/t5/Jira-questions/How-do-I-add-more-fields-to-the-Service-Desk-Request-form/qaq-p/9005
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