The Dependency Tax Offsets dialog is opened from the Individual return at item T4, or T6 or by selecting the worksheet from Preparation > Schedule > (shz) Invalid or carer, Zone offsets.
You can't claim a zone or overseas services offset unless you reside in the zone. Fly-in/Fly-out no longer qualifies.
The menu provides buttons to access separate dialogs for:
Invalid spouse or carer
Maximum offset rates ATI and Reduction %