Returns the specified value with the specified characters replaced by the specified string.
Stuff(PropAbbrev: String, CharsToReplace: String, ReplacementChars: String): String
PropAbbrev is the name of the property to use.
CharsToReplace is the string value to search for.
ReplacementChars is the string value with which to replace the found string.
Stuff(Abbrev(),GEO,RIO)
If Abbrev is GEO101, then the return value is RIO101.