Due to chemo brain, I've lost my ability to think and create what should be a simple workflow.  I need to move old data from a template that use to have 2 identifying numbers to a new template that has 1.  The fields may each have a value or only 1 has a value.  The primary number of the 2 fields always takes precedence.  If, however, there isn't a primary number the secondary number should be used.  I have been staring at this for hours and getting nowhere.  Any help would be appreciated.