The solutions record might have the following options: Link to request category (Yes/No): Link to Service Catalog (Yes/No). If either or both options are true (Yes), then the categorization structure would be displayed (activated) in the form of drop down lists for the user to select.
This feature should easily accessible during the work flow of creating a service request or incident ticket (button/frame/link to new window), perferably in the form of a control that could be placed on to forms and templates as desired.
Thank you for considering our suggestion,
Craig Rice