Glenn.
Two existing profiles can only be linked if the prime data in each is identical, i.e. the manufacturer, the model and the cn.
I have deleted the duplicate profile. As we cannot alter FAA entries, I deleted C-FCDH from the database, (the photos remain ) and then, in the FAA profile, I linked to C-FCDH.
My bad in that I failed to check C-FCDH for other details. You may wish to edit as necessary.
Thanks,
Malcolm.