On the other hand, from one version to another, new fields has been defined as standard ones, by the system.
For example, today, there is a standard field called "Institution Name" under the "Education" tag.
Long before this "Education" tag has appeared, there were users who had defined such a field under one of their Custom Tags.
Generally speaking, what's needed today, is a tool which would make possible the removal of the content of a field defined under Customs Tags, to the parallel one defined under a standard TAG of the program. (something which shall scan the entire database, removing data from a given field A to another given field B). After the action takes place, the field "A" should become empty (and ready for being deleted from the database).