Normally, the only field that can be changed in the Attendee table that will update to the Individual table is the Email. This option was added for quick email confirmations.
With the latest release, SAMS30205, if the "Upd Indv?" field is turned on in the meeting information screen, an individual's demographic information will be updated when an attendee record is saved.
NOTE: Any slight change to the data in the field in the Attendee table that is different than what has been entered in the same field in the Individual table will not allow the update of that field from Attendee upon saving.