Q: How do I change a custom field from a select box, or list, to a drop down list in RT 4 ?

Answer

You must be a queue admin on the queue to which this custom field is applied. If you are not, please contact the appropriate queue admin.

• Go to Tools > Configuration > Queues > Select
• Select the queue where you want to change the custom field display
• Select Ticket Custom Fields link in the upper right menu bar
• The Selected Custom Fields section shows the custom fields applied to the queue
• Click on the custom field, whose display you would like to change
• Change Render Type to Dropdown
  
• Click on Save Changes