You can create a Ticket Type Attribute
The description of the attribute presented to the teammate or contact
The data type of the attribute
Whether the attribute is required to be filled in when teammates are creating the ticket in Inbox.
Whether the attribute is required to be filled in when contacts are creating the ticket in Messenger.
Whether the attribute is visible to teammates when creating a ticket in Inbox.
Whether the attribute is visible to contacts when creating a ticket in Messenger.
Whether the attribute allows multiple lines of text (only applicable to string attributes)
A comma delimited list of items for the attribute value (only applicable to list attributes)
{ "name": "Bug Priority", "description": "Priority level of the bug", "data_type": "string", "required_to_create": false, "required_to_create_for_contacts": false, "visible_on_create": true, "visible_to_contacts": true, "multiline": false, "list_items": "Low Priority,Medium Priority,High Priority", "allow_multiple_values": false }