Regarding the "Prefix" field.....Do you record Mr./ Mrs or Miss in the "Prefix field" ONLY when the person included/wrote it on THEIR document OR
do you try to include it every time? What do you do for a child or person under 18, then?
Type what you see and don't type what you don't see are the basic rules for indexing.
So, you would never type a prefix that was not actually written on the document.