You can create a cascading select as a type of custom field. Which you can then use on your Service Desk portal.
To do so, go to custom fields (you need admin permission for that) and add a cascading select field where you define the categories and their sub-categories. Then go to the service desk project and map the field on to the portal, like the other fields.
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the secret is the abysmal interface. The options for "edit" and "configure" take you to different screens. you probably want "configure"
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