INCREMENTAL BACKUP menu option is MISSING in PHDM 16????

HOW to do an INCREMENTAL backup, to attach to a FULL backup, in PHDM 16 (paid version). IN PHDM 15, you had an option to either do a FULL backup, OR an incrfemental backup, and you could attach the incremental backup to one of the full backups.
in PHDM 16, I did a FULL backup - now I want to do an INCREMENTAL backup, but there is no menu option for this? there HAS to be, so I can do this as desired, and not through a backup job?
thanks