Add Custom Fields from Request Screens in Manage CMDB Tasks

Has anyone managed to add the Designer created Custom Fields on a Request Screen to the criteria used as part of the "Manage CMDB Task" transaction?

I have created a Single QD field based on Configuration Item, when this is selected I want to update the Custom_Profile_1 field at regular points within the workflow, however I can't find where to add the Custom QD Field under Select Item(s) on the Update Item Details transaction window.

I am able to use the Request CI Item but this is a Multiple QD field and I want to restrict it so that only 1 CI can be selected.

Any help appreciated